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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. Feeds flawlessly. 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. Higher pressure equte to parts (bcg, buffer, buffer spring, ROUNDS, etc) experiencing much higher wear/tear. 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. Does it make a big difference? Barrel customizations are also available. Paste as plain text instead, Looking to spend $180-250 (depending on condition, forge mark and if a rear sight is included or not.) When carrying out feed ramp polishing, it is crucial to prioritize the frame's angles, which is a critical part of the feed ramp. Required fields are marked *. Notice how the ramp starts on the barrel extension and not in the receiver. 4. Not all mil-spec features advertised on the product information are the real mil-specs. The Fora platform includes forum software by XenForo. You need to match up barrels to receivers for optimum performance. 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. Would not feed to save its life! You want them to match. It has 2 ramps cut into the receiver to help the rounds feed into the chamber. He had more to say and added some more engineer and gun designer speak too. 338 and others not the .308 76251 or 6.5 creedmore which o think should have a.30cal feed ramp.? I have seen it done many, MANY times and if done right, it works/functions 100% without issue. For use by barrel manufacturers. [ARCHIVED THREAD] - M4 feed ramp barrel in a non M4 ramp upper. can the barrel extension be bought individualy? i have an extra brand new M4 barrel extension ramp to replace a rifle ramp. For a better experience, please enable JavaScript in your browser before proceeding. 5. However the DD 14.5 are ideally meant to mate up with M4 style upper receiver feedramps. Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. Will my A3 upper reciever work with my M4 barrel extention.According to some or your posts they will.Thanks Bill. You have the option of barrel type, thread, fluting, finish type and to add a match bolt. No need to alter the upper. pm me at BOG or PG, or get in touch with my number 09177542777 if you're interested. Full M4 feed ramps start on the upper and continue onto the barrel extension. SKU: BCM-URG-M4-16 Features: M4 Feed Ramp Barrel Extension Caliber: 5.56 NATO Barrel Length: 16in Barrel Style: Standard Handguard: None BCM M4 Handguards (Double Heat Shield) - Black + $15.00 PKMR (Polymer KeyMod Rail) Carbine Length - Black + $24.95 PKMR (Polymer KeyMod Rail) Carbine Length - Flat Dark Earth + $24.95 Stock Status: Out of stock Being a Newbie AR owner ((Ive been an avid gun owner for nearly 50 years), I appreciate the information and visual aids that Im sure will be a big help in enjoying and using this gun platform. Is getting it as part of the upper better? I got my help from this thread, and thank you again to ORD. From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm. Check often for fit. To conclude, the M4 feed ramps bring a lot of improvements to the AR-platform firearms. - The Shooter's Log, 2012 SHOT Show Special Report: Del-Ton TRX Rifle and More! When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Edited April 27, 2014 by Mark Gale By Rear side of a CZ-75B pistol barrel showing the (here dirty) feed ramp. The first reason is that they are, indeed, better. Founded by Frank Galli in 2000, Snipers Hide has been offering informational videos, podcasts, and other support to its users in one location. 's blog. As a result, the factory machined M4 feed ramps on the receiver are hard coat anodized which adds significant strength to the aluminum. By the time you made it work you spent more time, money, and effort than if you just bought a new barrel or upper. 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. Personally, I would sell the rifle upper and buy an M4 upper - the cost will be small and you will end up with a more satisfactory end product. FWIW one of my rifles has M4 feed ramps on the barrel and no M4 feed ramps on the upper and it has functioned just fine. DSA has fat top, Mueller, non feed ramp uppers for $40. Olympic Arms Upper receiver with rear sight assembly and forward assist and dust cover has M4 feed ramps $260 View attachment 1016575 View attachment 1016576 Brevity matters. CARBON-15 Stripped Lower Receiver Clear editor. This has been my concern with modifying the aluminum parts. M4 feed ramps will extend the barrel extension and the upper receiver. All things being equal and having used both weapons extensively, Id rather have the feed Ramps. May 17, 2008 in The Armorer. Thats true overall and good to keep in mind. The M4, and the CAR-15, before it have had similar problems like the ones you mentioned. Contents: 1 Diamond Burr (For Colt 2 Stage Ramps) 1 Cut Lube (For Diamond Burr) 1 Bullet Stone (For Reshaping . I didn't forsee that we'd ever see the day when replacement parts would be so hard to get. There are now thousands of upper receivers and ready-to-use barrels that have the cuts of M4 feed ramps. If your upper isn't showing signs of bullets rubbing on the aluminum under the barrel extension, you should be good with M4 ramps. The Mission of Cheaper Than Dirt! So the engineers lowered the feed rampa into the receiver. colt A1E1 733 uppers didn't have extended carbine feedramps ? Backing up a ton: The ramps on regular barrel extension are cut just to the edges, while the M4 feed ramps have deeper cuts in the M4-spec upper receiver. Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. The barrel extension and the receiver both have to have the cuts. All Rights Reserved. Absolutely nothing to do with casing diameter, or whatever other weird sht you guys imagine. Theres a bit more to it than just polishing. 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. is the m4 feedramp common in barrel extensions? 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 last is using the best and right ammo for the job. Given that most of us dont always have perfect access to truly genuine Mil-Spec, mil-standard parts (those actually used in issued fighting tools), were shopping based on a little part trust and a bigger part knowledge. I wont buy a barrel that isnt a wylde 223 556 but Im only now noticing. All this basically means is that the ramps continue from the barrel extension down through the upper receiver tonthe magazine. In military situations, it is advantageous for rifles to function with damaged, worn, or less than ideally serviceable magazines. I have a 723 build (w/ C7 upper) and a 727 build (A2 upper) that use 14.5" Colt M4 barrels. 3. I would only add the feed ramps to the receiver if I had feeding issues, which you should not have. This USGI modification was done to both the barrel extension and the upper receiver, creating a longer and steeper feed ramp. They aid in feeding the round into the chamber from the magazine more easily, which make uppers and barrel extension matched. Its not a big deal but still an important thing to remember and understand. M4 Feed ramps on barrel extensions are a solid example. You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers. are all barrels w/ m4 feed ramps?? . It's best to use rifle/rifle combo or M4/M4. So there's a lot more going on with rounds bouncing up and down in the mags etc. Metal cases ammunition such as Wolf through an M4 clone? which is bad combo. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. Get The Best Trigger Pull Gauges To Make Every Shot Count. Upper Receiver, A4, Flat Top, USGI, Numbered, AR-Stoner Upper Receiver Stripped AR-15 A3 Flat-Top Matte, Black River Tactical 16 Cold Hammer Forged Optimum Barrel Accuracy Evaluation. Display as a link instead, Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. The mil actually only specs M4 feed ramps for use in its M4s. I like all my guns to be reliable. Don't ever put non M4 ramped barrel on a M4 ramped upper receiver. Only took a few minutes. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. I suggest you get a rifle receiver. pictures would help. hey bro nice to see you here!!! Damaged Ak front end Barrel in Trunnion with or without sight bases. Anything else you want to share about M4 clones would be appreciated, especially when it comes to a reliable rifle. You wrote that much to make a point that should have taken about 100 words? Watch a video about our Modern Series AR barrel: Supposedly you'll only notice issues with rapid/auto fire with a configuration like this. M4 Barrel Extension (M4 Feedramps) $22.95 (4 reviews) SKU: Barrel-Extension-M4 Stock Status: Quantity: Add to Wish List Description For your AR15, M16, M4. I will attest that a rifle upper and a barrel with the M4 feedramps works just fine. M4 extension with .350 M4 style feed ramps 11 Degree Target Crown Threaded Muzzle 5/8"x24 TPI Weight: 26.5 ounces And it appears that the bolt is slamming into the top of the bullet. "It will last 5k rounds instead of 4k. Avoid Polishing Too Lightly Or Too Roughly By Mind shooting me a link where I can pick on a C marked A1 carry handle for $150? True, which is why they're not even needed in semi autos. So I'm working on my first build, and I'm a little confused. I've seen that pic, it is a good reference. It's near impossible to replace the carry handle upper I have these days, and finding a colt chrome lined 20" light weight barrel isn't a walk in the park either. well.. it's kinda hard to get stuff in this part of the world. 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. By Yamil Sued August 6, 2021. Everything that you have on your side to make any weapons more reliable and work when it absolutely needs to is a plus. M4 barrel to non M4 receiver is fine, but not the other way around. I'm a machinist in the aerospace industry and lucky enough to have unrestricted access to a really nice machine shop so the modification from rifle to M4 feed ramps is no sweat, I've done it once before a few years back with a .250" carbide cutter in the mill for a friend and it came out looking indistinguishable from a true M4 extension. what I fear the most is having an m4 ramp upper and then getting a barrel with a rifle ramp. I built the upper using a Mega upper with a Compass Lake 18" barrel. I have done the same, protect the Barrel extension with a layer of electrical tape and carefully file or Dremel the ramps into the aluminum receiver. I just need a little guidance on this and I'm having trouble getting good results from Google. http://www.ar15fornoobs.com/wp-content/uploads/feedramps.jpg. And that the M4s and M4A1s are issued M855 which has a slight difference in bullet shape vs. the older 55gr M193 BALL. It's best to have M4 ramps on both the upper and barrel. Installing a Luth-AR Rifle Buffer Tube and an A2 Stock #1041. Issues can arise when receivers and barrel extensions are mismatched. The Shooter's Log, is to provide informationnot opinionsto our customers and the shooting community. For new construction barrels only. The leading cause that leads to the development of the M4 feed ramp is the gas pressure from the carbine gas system that is increasing along with a high cyclic rate. I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. I cant advise on that one folks. The parts are interchangeable. 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-. If you have a bolt that you would like to use you are welcome to ship it to us for accurate headspace. Your discussions, feedback and comments are welcome here as long as they are relevant and insightful. Here you can see an upper with "rifle" feedramps. if you are OK with 3MOA, you might go 20,000 rounds! AAC and anybody else that has any reasonable expectation of quality and reliability use an M4 feed ramp. I can still use the combination. This includes M4 feed ramps, barrel nut, front sight tower and sight post, and -28 threads for a muzzle device. Only took a few minutes. Questions on how to install your new BA barrel? 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. However, they do have M4 feed-ramps which is not clone correct. Caught a deal on a matched barrel and bolt. upper recievers and barrels are hard to comeby. I've modified barrel/receivers even before M4 cuts came out and done some receivers when the barrels had cuts. Thread: Adding M4 feedramps to A1/C7 upper. The barrels also had to be modified. I have a non ramped barrel in a ramped upper, feeds fine. I notice that's a Gibbz (or Gibbz-type) upper. If you have an account, sign in now to post with your account. The barrel Throat is the second most critical component after angles and should be polished with utmost care.