Is it kosher to add M4 feed ramps to a standard upper to match an m4 ramped barrel? 3. I like getting another Upper idea then you could end up with two rifles! And it appears that the bolt is slamming into the top of the bullet. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. instead of mil-spec. From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm. You want them to match. Notify me of follow-up comments by email. To measure just where the round makes impact on the feed ramps, I did not use any sort of micrometer to measure. Add 3% to the total cost for credit card purchases. Damaged Ak front end Barrel in Trunnion with or without sight bases. By It is a tightly machined and polished piece of metal which guides a cartridge from the top of the magazine into the firing chamber of the barrel. This space is for pictures of "retro" Stoner rifles and completed or partial retro AR-15 builds, as well as discussions about either. I didnt think anything about it having M4 feed ramps. The rifle receiver, doesn't have ramps on the receiver, they are only cut into the barrel. It is milled out of 6061 T6. what does it do?? Then you can get a regular rifle barrel for the upper with no ramps. I'd get jams from bullets hitting the back of the upper so I took a small round file and made the M4 ramps in the upper. It's not worth changing the barrel extension on an already finished barrel, getting the new barrel extension to line up correctly with the gas port will probably cost more in gunsmithing/machining fees than buying a new barrel. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. JavaScript is disabled. I've seen uppers with and without anodizing on M4 ramps . it seems to me to be about 50/50 with and without. Mind shooting me a link where I can pick on a C marked A1 carry handle for $150? I can still use the combination. Edited April 27, 2014 by Mark Gale Finding the proper upper receiver is your best option. Any use of this content without express written consent is prohibited. If your magazines are set up correctly, and the feed lip edges polished smooth, each round fed from the magazine will go directly into the chamber. Theres a bit more to it than just polishing. In military situations, it is advantageous for rifles to function with damaged, worn, or less than ideally serviceable magazines. M4A1s run at 950 rounds per minute in full auto and even 950+ rounds per minute as the gas port erodes open bigger and bigger with wear and allows them to run even faster and much more violent. Check often for fit. You can put a M4 barrel and non-M4 receiver together, but you can't mismatch them the other way. The reason I decided to write about this topic at all was because there are some mil-spec features advertised on aftermarket parts that arent even really mil-spec. Reddit and its partners use cookies and similar technologies to provide you with a better experience. There's no downside to having M4 feedramps on your carbine, but they are not as necessary without full auto and when using followers that will not tilt (or in a 20 AR15). All NFA rules apply. The M4 Style Feed ramps And Barrel Extension Provide Consistent Feeding And The Matte Black Manganese Phosphate Finish resists External Corrosion And OxidationLength: 14.70"Model: AR-15Finish: Manganese PhosphateBarrel Type: Carbine LengthBarrel Features: Chrome-LinedManufacturer: FN Mfg Number: 20-100405Model: AR-15 . M4 M-4 Feed Ramp Jam with 55 gr grain Bullets, Solution, Fix, AR15 AR-15 Stuck Cartridge iowaunemployment 21K views 10 years ago Comparing AR15 barrels -Faxon vs. Bear Creek arsenal-. Insert the barrel and sharpie the cut area, then use the right bit on a dremel. So I called. BUT if you find someone to grind your feed ramps and they do a good job, post it up and let us know. You CAN modify a rifle/A2 barrel extension to an M4 style extension, but it isn't always the best way to go unless you just have to do it. Can I use a barrel with M4 feed ramps with an upper that isnt M4 matched? Get The Best Trigger Pull Gauges To Make Every Shot Count. Required fields are marked *. However Ive built numerous ar15 and lr308 rifles and pistols. Barrel is medium SPR profiled barrel, threaded with a 1/2-28 thread for the AE brakes and collar. UPPER RECEIVER: AR-15 Mil-Spec Machined out of 7075-T6 Forged Aluminum, M4 Feed Ramps, Cerakoted Magpul Flat Dark Earth (FDE) Color with Forward Assist and Ejection Port Cover Installed BARREL: 22 inch, 223 Wylde Caliber, 4150 CMV, 1:7 Twist, Heavy Bull Barrel Profile, Straight Fluted, Melonite/Nitride Finish - made for us by Tactical Kinetics HAND So, lets glide down these lines below to erase your misconceptions about them. The mil actually only specs M4 feed ramps for use in its M4s. Modern Series Barrels. Please allow 5~10 days for assembly and testing before ship date. What is the difference between Modern, Performance, and Premium Series Barrels? 308 m5 using m4 feed ramps, which I belive are for the smaller round like. are all barrels w/ m4 feed ramps?? The first reason is that they are, indeed, better. They are better! We want you, our readers, to be able to make informed decisions. The barrel blanks available are made from 416 Stainless Steel. One of the AR15 engineers under Gene Stoner pretty much said that the M4 isn't a good platform, especially once the gas port erodes a bit. This can lead to a rare but odd situation; barrel and receiver mismatch. Either way is good and both types work great with semi auto only guns. Now move move the on deck cartridge forward to the 3/8 of inch position and again note the position of the tip of the bullet in relationship to the barrel extension. I too built a .458 SOCOM carbine . Some, me included, have said that the M4 ramps are a help to some of the larger-diameter cartridges in use, such as 6.5 Grendel or .22 Nosler. If it's happening regularly, check the magazines you are using for serviceability. While I've got everything apart, I'm thinking I just want to put an M4 barrel extension on. Here you can see an upper with "rifle" feedramps. If you aren't 110% comfortable with doing the job, and you do not have all the tools and equipment to do it properly, then have a smith do it for you. It's an interesting question. They guide the bullet up and into the chamber. Does anyone have a follow up that confirms or denies my claim? Caught a deal on a matched barrel and bolt. I should have taken my own advice for once. Costs about $40-50 to have the feed ramps reprofiled from what I can gather. I will check with compass lake. He had more to say and added some more engineer and gun designer speak too. All Rights Reserved. So, I had purchased a 458 upper. Ballistic Performance of Federal Punch .22 LR Ammunition with the Heritage Barkeep #1063. It was in the last few issues of SAR. this is the barrel designed and profiled for the Mark 12 Mod 0 uppers and rifles. We reserve the right to edit as appropriate, delete profane, harassing, abusive and spam comments or posts, and block repeat offenders. A4 Complete Upper Receiver - 7075 Forged A4 Flat Top Upper Receiver - M4 Feed Ramps Includes: - Add to Cart. I think your mistaking that with adding ramps to the receiver. I am having a tough time finding an in-stock barrel (18 or 20 incher) with a rifle extension on it. I just need a little guidance on this and I'm having trouble getting good results from Google. Married pretty well with my Seekins machined lower. I can probably get the upper reciever first. This 20" BCM barrel is machined from SS410 stainless steel. Share it in the comments section. The tip of the cartridge rarely comes into contact with the upper receiver. May 17, 2008 in The Armorer. Full M4 feed ramps are on both the upper and barrel extension. ago Costs about $40-50 to have the feed ramps reprofiled from what I can gather. The upper I want to rebarrel is modified for Service Rifle competition so it's not quite as cheap as buying another $89 upper from Aero. In short, if you have a Dremmel you can do it yourself. Earlfillmore 13 hr. The ramp angles are different and changing the profile of the extension doesn't make it something it isn't. This includes M4 feed ramps, barrel nut, front sight tower and sight post, and -28 threads for a muzzle device. We have four combinations here: The Fora platform includes forum software by XenForo. I wouldn't be concerned at all with any wear after modifying an upper receiver. Proper maintenance and lubrication. Guess what? Thanks! I'm lookin for a clear definition as to what they are, and what they do to enhance a given rifle's performance? Thanks. M16s and M16-A1s run at 750 rounds per minute in full auto. By the time you made it work you spent more time, money, and effort than if you just bought a new barrel or upper. You can run M4 cut barrels with rifle receivers, but not the other way around as it will create at catch that can hang up the bullets. By document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Owning Best Ruger SR9c Accessories Can Change Your Life. . A feed ramp is a basic feature of many breech loading cartridge firearm designs. By my estimates, the tip of the bullet first hits the barrel extension about 1/3 of the way up the respective feed ramp on the barrel extension. A4 Complete Upper Receiver. M4 Feed ramps on barrel extensions are a solid example. Previous. Read Now. Some suggest taking a grinder to the extension area. "C" stamp and CAGE code available. Again, youll find plenty of videos on spooling up hand grinders to remedy feed ramp and ejection port issues with these larger cartridges, but I strongly suggest going factory-done aftermarket. All this basically means is that the ramps continue from the barrel extension down through the upper receiver tonthe magazine. I've modified barrel/receivers even before M4 cuts came out and done some receivers when the barrels had cuts. However, an M4 barrel extension is dished more so the feed ramps could extend downward, and then an area within the upper is shaped to match. 410 stainless is also harder and more corrosion resistant than conventional 416 stainless found in other commercially available precision barrels. Is one better than the other? And that the M4s and M4A1s are issued M855 which has a slight difference in bullet shape vs. the older 55gr M193 BALL. I am glad to know that I need to look for changes in design and the differences in the A2 and A4 feed ramp / rails. Copyright 1996-2023 AR15.COM LLC. FN AR-15 5.56X45mm Nato . Does NOT include pin By Yamil Sued August 6, 2021. After two months of back and forth, cleaned up the feed ramps. I read in Bravo company that there are 2 kinds of flat top upper. No need to alter the upper. In this episode of Gun Stock Reviews, we look at the difference between M4 Ramps and the old standard ramps of the past. Was sort of worried about how it would run with an 11.5" barrel and mismatched ramps, but it sounds like it should be good to go either way. There are now thousands of upper receivers and ready-to-use barrels that have the cuts of M4 feed ramps. Copyright 2016 - 2023 by AdventureFootstep.com. The difference between standard feed ramps and M4 ramps is easy to see. Press question mark to learn the rest of the keyboard shortcuts. Here's some info from Randall Rauch aka www.ar15barrels.com, if your barrel extension has M4 ramps you should have an upper receiver also with the ramps. While this gun is a more of novelty build than a "serious use" AR, I intend to use good parts and want it to run as well as my other ARs. The dimensions are different between the two, so theyd have to change some things to the feed ramps dimensions. Little polish. Feed ramps being m4 or. Our 6mm ARC barrel come standard with 1-7.5 Twist, M4 Feed Ramps and gas tube. from my service in the 70s to my personal weapons, all of my ARs are early 1970 slab sided Colt SP1s. Should not be too hard. Do you have an AR barrel or feed ramp tip? Can someone recommend or point me in the right direction of a good quality upper receiver for an SPR build that does not have M4 feed ramp cuts in it? The angle is going to be key, alot of people attempt to mimic the angle of the barrel feed ramps, this is incorrect. How long your barrel "lasts" depends on what your accuracy threshold is before you decide it is too bad to keep using. However, they do have M4 feed-ramps which is not clone correct. /r/ar15 is here for your favorite black gun links, build pics, questions and other tactical or practical information. Seems M4 is all the rage these days. Thats an important thing since without the feed ramps, issues can arise when receivers and barrel extensions are mismatched. When you need to nail something you use a hammer not a wrench. Thank you for answering the question do well. A couple of times I ended up with the OK set up from the picture above. With the increased use of larger-diameter cased cartridges, the M4 feed ramps are proving their values when using them in those cartridges. What is an m4 feed ramp? You need to match up barrels to receivers for optimum performance. True, which is why they're not even needed in semi autos. Reach in through the ejection port and slide the on deck cartridge about 1/4 inch forward and observe the tip of the bullet in relationship to the barrel extension. In general, all you need to understand is that the M4 feed ramps include the barrel extension and upper receiver. 16" Pre-Ban M4 Profile Barrel Assembly CARBINE Gas System About Upper assembly comes completely head spaced and test fired. If you have a bolt that you would like to use you are welcome to ship it to us for accurate headspace. It has ran flawlessly (barring tuning of the gasblock when new) with several different brands of magazines and ammo. BEFORE YOU GO MODIFYING IT, check your headspace.I have a Gibbz upper in my junk drawer because the upper -- for some reason -- wouldn't allow a perfectly good bolt (as checked by Criterion) to headspace correctly on a Criterion barrel, with the bolt installed in the carrier. Product Details Douglas 18" Flat Dark Earth Cerakoted 416 stainless steel barrel with 1-7 twist and M4 feed ramps. Amazing what happens in a thread over a simple question. I would just make sure to order rifle upper with rifle barrel extension or M4 upper with M4 barrel extension. Upload or insert images from URL. An upper without feed ramps can be used with a barrel that has them as the majority of the ramp is on the barrel extension. Go back to writing school. Somwhere in the 1990s I believe, Colt designed the M4 feed ramps, where they took some of the material out of the upper receiver, cut two little ramps in it and then cut the ramps in the barrel extention a little further forward. - The Shooter's Log, 2012 SHOT Show Special Report: Daniel Defense DDM4 V5 in .300 Blackout and a Factory SBR - The Shooter's Log, 2012 SHOT Show Special Report: SOG Armory Predator Rifle - The Shooter's Log, Surefire's 100-Round MAG5-100: The Highest Capacity AR-15 Magazine - The Shooter's Log, Throwback Thursday: Taurus Judge Range Report, ATI Milsport SGA 410 All the Advantages of an AR in .410, Ruger SR1911 LW Commander The Lightweight .45 ACP, Rifle Hack: Sighting for 100 Yards at a Distance of 25 Yards, Throwback Thursday: All About Bullet Grain. if you are OK with 3MOA, you might go 20,000 rounds! Ideally both. Paste as plain text instead, upper recievers and barrels are hard to comeby. Go slow and you'll be done in no time. practical_man Those ramps line up with the barrel, which are cut deeper than on a rifle barrel. hey bro nice to see you here!!! These units actually feature the NON-F-Marked (correct) front sight base. On AR9's, I understand the distance between the Mag Follower and the Feed Ramp is a known complication in the design. I had seen these pix years ago and dismissed the idea of mix and match. You have a rifle barrel. Clear editor. I got my help from this thread, and thank you again to ORD. *Must have a registered ARFCOM account to win. colt A1E1 733 uppers didn't have extended carbine feedramps ? The barrel Throat is the second most critical component after angles and should be polished with utmost care. Press question mark to learn the rest of the keyboard shortcuts. Feels like a silly question now that it makes sense. I recently picked up a barrel that I thought had M4 feed ramps, but it doesn't line up with my M4 feed ramp upper. You can modify the upper, but bear in mind that the un-anodized aluminum surface will be very soft and prone to wear if your particular bullet hits it frequently. The parts are interchangeable. AAC and anybody else that has any reasonable expectation of quality and reliability use an M4 feed ramp. The good idea is that the round, presented at a lower plane, will contact other lower feed ramps and go right on in. Id just get one for that barrel and find a barrel with m4 extension for the upper you already have. The upper is designed to have two levels of top rails for mounting of night vision in front of scopes. Which Model Colt 1911 is For Me? The Shooter's Log, is to provide informationnot opinionsto our customers and the shooting community. The Bullet ~ Handguns, Rifles and Shotguns, http://thearguys.com/ar-facts/m4-feed-ramps/. Questions on how to install your new BA barrel? For a better experience, please enable JavaScript in your browser before proceeding. Machined from 4150 Chrome Moly Vanadium Steel and feature a QPQ corrosion resistant finish and QPQ coated M4 feed ramp extension. Gas block area is .750 diameter. Add M4 cuts to Barrel Ext $15.00 We can modify your rifle extension to match the M4 cuts in an upper receiver. Use this M4 Barrel extention with M4 feedramps. Im an old vet, now retired and looking to build some ARs as a hobby to keep me doing something that I will enjoy. Man, its crazy how many of yall have absolutely no idea why you do what you do. Full M4 feed ramps start on the upper and continue onto the barrel extension. Its also recommended you polish the ramps once youve achieved the appropriate angle. Not saying a really good gunsmith cant do it, just that theres a bit of an involved process. It is removeable with a special wrench and a barrel clamp/vise. again, Thanks. Come join the discussion about racing, builds, pro mods, hot rods, events, turbos, nitrous, superchargers, and more! Polishing the edges of the chamber mouth to remove the edges of that chamfer will. Contents: 1 Diamond Burr (For Colt 2 Stage Ramps) 1 Cut Lube (For Diamond Burr) 1 Bullet Stone (For Reshaping . Founded by Frank Galli in 2000, Snipers Hide has been offering informational videos, podcasts, and other support to its users in one location. Using an upper with M4 feed ramps with a barrel that does not have them will lead to feed problems as it creates a ledge/lip that can catch the bullet tip as it tries to feed. Remember less is more, little by little. I prefer them. I have seen it done many, MANY times and if done right, it works/functions 100% without issue. Feeds flawlessly. In case My barrel is rifle ramp it won't be so bad after all. Description. The best case is to have both an upper and barrel that have the feed ramps. The M4 receiver feed ramps are cut at a steeper angle and, as a result, extend down into the receiver wall. Related: If you are using a Ar rifle, best green laser sight is good choice for hunting. - The Shooter's Log, 2012 SHOT Show Special Report: Del-Ton TRX Rifle and More! Would not feed to save its life! Create an account to follow your favorite communities and start taking part in conversations. To conclude, the M4 feed ramps bring a lot of improvements to the AR-platform firearms. which is bad combo. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. Single Action and Double Action Which One Is Better For You? Snipers Hide is a community of Snipers of all kinds, focusing on long range shooting, accuracy, and ballistics. The M4 ramps, if I am not mistaken, were originally made to help reduce malfunctions on the M4 carbine. I've shot a good deal of rounds through 20" A2's and I realize they run but you are describing issues that the M4 feed ramps alleviate, that would probably be good to reduce on A2's as well. For the purposes of this chapter, we'll call the new one the M4, and the old one the AR. This Kit is made to cut or polish the STEEL Feed Ramps on your Barrel Extension ONLY. However, its rare now to find an upper receiver or a ready-to-go barrel that doesnt have the M4 cuts. 5. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. For new construction barrels only. Backing up a ton: Any and all AR-15 barrel extensions have feed ramps. America's Ultimate Shooting Sports Discounter, Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on Pinterest (Opens in new window). Lol. Buy AR 15 16" .350 Legend Nitride M4 Profile Barrel 1:16: GunBroker is the largest seller of AR15 Parts Gun Parts All: 974000728 . Since the M4 barrel is one and a half inches shorter than the minimum legal barrel you can install in an AR15, the M4 gas tube will be, of course, smaller. The ramps on the regular rifle-type extension are cut just to the edge of the extension. The magazine lips cannot move, so with these larger diameter cartridges, the bullet tips down lower about the centerline of the bore (half of the diameter increase to be exact). Another reason is that any commercial receiver and parts makers want to tool up to make upper receivers and barrel extensions, especially when shorter guns are becoming more popular. For someone who is new at trying to understand feed ramps it helps to read a couple different explanations. You can always buy a non-m4 extension and have the new barrel retimed and headspaced, but it will probably cost more than a new upper receiver. They . The barrels also had to be modified. My experience with ARs is all A-1s. check out the. Looking to spend $180-250 (depending on condition, forge mark and if a rear sight is included or not.) Regular feed ramps are cuts into the barrel extension only, which allows guiding the round into the chamber during loading, making them a fundamental feature of many breech-loading firearm designs. "It will last 5k rounds instead of 4k. The only one I found is LaRue's upper, but it won't work with the hand guard I'm using (Geissele MKIII). That is what I tell people when they try to convince me that they need a stainless barrel instead of chrome-moly. I have a 723 build (w/ C7 upper) and a 727 build (A2 upper) that use 14.5" Colt M4 barrels. CARBON-15 Stripped Lower Receiver I'm assuming that you only need the ramps from one or the other. For this test, I used a Colt upper with M4 feed ramps and a SOCOM heavy 14.5 barrel, just like what is used in the military. Moreover, telling someone that an extension can be modified, while not a lie, is nothing more than mental masturbation when your post contains a caveat for having the knowledge and proper tools. Our 6.5 Grendel Black Nitride rifle barrels are made from the finest 4150 Chrome Moly Vanadium and precisely rifled for high accuracy at a great price. Its a miracle! 's blog. For a better experience, please enable JavaScript in your browser before proceeding. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. All Rights Reserved. Its easier to add feed ramps to the receiver not so easy to add them to the barrel extension. They offer a lower, more extensive, and smoother entry for any round of ammo, whether its necessary or not. You can post now and register later. [ARCHIVED THREAD] - M4 feed ramp barrel in a non M4 ramp upper. I can assure you that most mods that deviate from the original design aren't 100% reliable. They were not intended to be super long range man killers. Everything that you have on your side to make any weapons more reliable and work when it absolutely needs to is a plus. You need to match up barrels to receivers for optimum performance. That's an important thing since without the feed ramps, issues can arise when receivers and barrel extensions are mismatched. Rear side of a CZ-75B pistol barrel showing the (here dirty) feed ramp. M16's fed pretty well before the M4 feed ramps were introduced. One new winner* is announced every week! AR Tech Tip - Checking M4 Ramps for overhang School of the American Rifle 84.8K subscribers Subscribe 2.9K 90K views 2 years ago AR Tech Tip - Checking M4 Ramps for overhang Show more Show more. First of Im not a gunsmith or firearms professional. The only other time it seems to help is if the mag is feeding the rounds with the bullet slightly angled lower than normal. Hasn't misfed yet, through initial break in up through 1k rounds, and that's mag length ammo. Notice how the ramp starts on the barrel extension and not in the receiver. Is it worth the extra 50 bucks?" "A Bad Day At The Range Is Better Than A Great Day Working". It's best to use rifle/rifle combo or M4/M4. Both. The M4 cut extends down beyond the edge of the barrel extension (has a scalloped appearance), and a correspondingly deeper cut in an M4-spec upper receiver effectively extends the ramps downward (theyre lowered). Featuring hand lapped 1/8 twist rate button rifling and M4 feed ramps barrel extensions, the 410 stainless barrel gives the shooter the best balance of weight and accuracy. When carrying out feed ramp polishing, it is crucial to prioritize the frame's angles, which is a critical part of the feed ramp. I cant advise on that one folks. Seems like it should work to me, but be a real challenge to keep clean and be damned ugly to boot. . They aid in feeding the round into the chamber from the magazine more easily, which make uppers and barrel extension matched. When I function tested it the first time with live half-jacketed rounds I had the worst FTF jam I have ever experienced. I recommend putting any AR-platform firearm together with a matched M4 barrel extension and upper receiver set, just because you can. I'm a machinist in the aerospace industry and lucky enough to have. If you don't clean it but demand 3/4MOA you might get 1,500. M4 can better explain their benefit, although they help with more reliable feeding. There is a picture of the various options, hopefully another poster can link them. The rifle-platform M16s dont use them. Its not a big deal but still an important thing to remember and understand. This includes M4 feed ramps, barrel nut, front sight tower and sight post, and -28 threads for a muzzle device. You wrote that much to make a point that should have taken about 100 words? Not all mil-spec features advertised on the product information are the real mil-specs. The barrel is supposed to have the M4 feed ramps. I suggest you get a rifle receiver. They are also 1/7 twist, 4150 steel, chrome lined, and button rifled like the real deal! Is getting it as part of the upper better? Site towers are not "F" marked SPECS: Length- 14.5". You absolutely do not want it the other way around however. M4 extension with .350 M4 style feed ramps 11 Degree Target Crown Threaded Muzzle 5/8"x24 TPI Weight: 26.5 ounces If it was some flat top + 16" FSB barrel id just swap upper/barrel, but this is a little more challenging to do that with. If a barrel comes with the feed ramps could I take them off? The best case is to have both an upper and barrel that have the feed ramps. I've been thinking about doing sort of an "Early Diemaco C8 carbine" clone build with a C7 style upper receiver. Well, over the course of 5,000 rounds at .40 a round, you spent two grand on ammo. Rifles, Uppers, Lowers, Barrels, and more, [ARCHIVED THREAD] - Rifle vs m4 feed ramps, http://i135.photobucket.com/albums/q125/PursuitSS/Postings%20photos/c0d26170b75c3e6f9ea65a7d0862247e.jpg. They provide a lower, wider, and smoother entry for any round of ammo, whether its necessary or not. It may not display this or other websites correctly. AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. Your previous content has been restored. http://www.ar15fornoobs.com/wp-content/uploads/feedramps.jpg. The rifle receiver, doesn't have ramps on the receiver, they are only cut into the barrel. I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. 4. I was planning on using a Daniel Defense 14.5 pencil barrel, because like the C8 they are CHF, lightweight profile, and .750 at the FSB (And also because quality carbine pencil barrels with .625 gas blocks seem to be in short supplyor else I'd just build a 723 clone.) . I have a non ramped barrel in a ramped upper, feeds fine.
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