It gives a longer ramp that is less steep into the chamber. If I was concerned with precision, I would seek out parts from well-known gun makers and customizers Baer comes to mind, Hart barrels, etc etc. Shorter length equates to much higher pressure in the upper receiver. - 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. 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. Clear editor. Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. 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. 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. It has 2 ramps cut into the receiver to help the rounds feed into the chamber. JavaScript is disabled. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. M4 Feed ramps on barrel extensions are a solid example. I think my question would be why rifle receiver+M4 barrel is just "ok" rather than "good", unless the point is that in a carbine-gas gun M4 ramps are just considered an improvement over no ramps. It's going to a gunsmith to be shortened and rethreaded anyways, can they just grind/polish the feed ramps to match or is it more involved than that? By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. The ramps are in the barrel extension. This USGI modification was done to both the barrel extension and the upper receiver, creating a longer and steeper feed ramp. That's an important thing since without the feed ramps, issues can arise when receivers and barrel extensions are mismatched. Press J to jump to the feed. I am having a tough time finding an in-stock barrel (18 or 20 incher) with a rifle extension on it. Powered by Invision Community. April 23, 2014 in Rifle - Technical. 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. The barrel extension and the receiver both have to have the cuts. Can I use a barrel with M4 feed ramps with an upper that isnt M4 matched? Previous. I will attest that a rifle upper and a barrel with the M4 feedramps works just fine. 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 . Founded by Frank Galli in 2000, Snipers Hide has been offering informational videos, podcasts, and other support to its users in one location. Im an old vet, now retired and looking to build some ARs as a hobby to keep me doing something that I will enjoy. What's the difference? M4 feed ramps. Caught a deal on a matched barrel and bolt. Its not a big deal but still an important thing to remember and understand. All comments are held for moderation and will appear after approval. They were not intended to be super long range man killers. 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). pictures would help. It is milled out of 6061 T6. It was in the last few issues of SAR. You can put a M4 barrel and non-M4 receiver together, but you can't mismatch them the other way. All this basically means is that the ramps continue from the barrel extension down through the upper receiver tonthe magazine. Feels like a silly question now that it makes sense. Its fine to use an M4 Barrel with a non-N4 (rifle) upper but if you have the barrel already is much simpler to just buy a M-4 upper and just replace the upper the barrel is harder to build..I have even cut ramps on a rifle upper and it really wasent needed That is before I knew better.Then I guncoted the ramps before I found out about Aluminum Black treatment. *Must have a registered ARFCOM account to win. The barrel is supposed to have the M4 feed ramps. ago KrinkyDink2 9 hr. For instance I was looking at the BCM upper receiver, and it said it had M4 feed ramps machined into the upper. 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. Not saying a really good gunsmith cant do it, just that theres a bit of an involved process. All Rights Reserved. Do you have an AR barrel or feed ramp tip? The dimensions are different between the two, so theyd have to change some things to the feed ramps dimensions. You have a rifle barrel. 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 I didn't forsee that we'd ever see the day when replacement parts would be so hard to get. 410 stainless is also harder and more corrosion resistant than conventional 416 stainless found in other commercially available precision barrels. Contents: 1 Diamond Burr (For Colt 2 Stage Ramps) 1 Cut Lube (For Diamond Burr) 1 Bullet Stone (For Reshaping . 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. We have four combinations here: 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. Theres a bit more to it than just polishing. You also repeated yourself. 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. I picked up a side charging upper from Sundevil last year. JavaScript is disabled. All we do is dremmel it to match - we dont remove it and grind to any specific angle. So the engineers lowered the feed rampa into the receiver. You will be able to leave a comment after signing in, AR15Armory.com Don't ever put non M4 ramped barrel on a M4 ramped upper receiver. And that the M4s and M4A1s are issued M855 which has a slight difference in bullet shape vs. the older 55gr M193 BALL. upper recievers and barrels are hard to comeby. How long your barrel "lasts" depends on what your accuracy threshold is before you decide it is too bad to keep using. again, Thanks. . Check often for fit. In general, all you need to understand is that the M4 feed ramps include the barrel extension and upper receiver. I'd rather just pay the gunsmith to make it work than hunt down another barrel/upper if possible. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. 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. which is bad combo. 2. In military situations, it is advantageous for rifles to function with damaged, worn, or less than ideally serviceable magazines. I'm lookin for a clear definition as to what they are, and what they do to enhance a given rifle's performance? M16s and M16-A1s run at 750 rounds per minute in full auto. Press question mark to learn the rest of the keyboard shortcuts. First, the M4 barrel and non-M4 upper isnt likely to cause issues, but due to the relief cut on an M4-spec upper, there will be a gap that works like an edge that most definitely can snag the bullet and stub the round. You are using an out of date browser. The M4 was the first (allegedy) carbine length gas system. Go slow and you'll be done in no time. Does NOT include pin Id just get one for that barrel and find a barrel with m4 extension for the upper you already have. 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. 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-. It's an interesting question. May 17, 2008 in The Armorer. I have looked and looked and looked. In short, if you have a Dremmel you can do it yourself. Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. I recommend putting any AR-platform firearm together with a matched M4 barrel extension and upper receiver set, just because you can. All things being equal and having used both weapons extensively, Id rather have the feed Ramps. Not all mil-spec features advertised on the product information are the real mil-specs. 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. Your email address will not be published. Come join the discussion about racing, builds, pro mods, hot rods, events, turbos, nitrous, superchargers, and more! Issues can arise when receivers and barrel extensions are mismatched. aaargh.. that's the setup I hate to see. Full M4 feed ramps start on the upper and continue onto the barrel extension. Shopping with us is absolutely safe - you never have to worry about credit card safety when shopping here Share your latest AR build or photos from the range with #RangeDayFriday for a chance to win a new firearm! 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. I don't have much to add re: feed ramps, but. I have a non ramped barrel in a ramped upper, feeds fine. However, they do have M4 feed-ramps which is not clone correct. Konza Defender M-LOK 5.56 16" Rifle 1x7 FEATURES: 16" 4150 Nitride 1x7 5.56 Barrel T-Marked Upper with M4 Feed Ramps Steel Micro Gas Block, and Carbine Length Gas Tube 15" 7075 T6 Aluminum Free Float M-LOK Hand Guard A2 Muzzle Break BCG is an M16 Style Nitride QPQ Finish Charging Handle Mil-Spec 6 Position Mil-Spec Diameter Stock Anything else you want to share about M4 clones would be appreciated, especially when it comes to a reliable rifle. Reddit and its partners use cookies and similar technologies to provide you with a better experience. On AR9's, I understand the distance between the Mag Follower and the Feed Ramp is a known complication in the design. I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. You want them to match. My factory JP CTR-02 has the appearance of the bottom right picture in the post above, M4 barrel extension in a rifle receiver, and there is not a mark on the aluminum under the barrel extension. AAC and anybody else that has any reasonable expectation of quality and reliability use an M4 feed ramp. They provide a lower, wider, and smoother entry for any round of ammo, whether its necessary or not. *Must have a registered ARFCOM account to win. Its a miracle! Any use of this content without express written consent is prohibited. Higher pressure equte to parts (bcg, buffer, buffer spring, ROUNDS, etc) experiencing much higher wear/tear. 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. I recently built an AR9 (Glock Mags) that has been running flawlessly for about 3-400rds. Proper maintenance and lubrication. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Owning Best Ruger SR9c Accessories Can Change Your Life. Please allow 5~10 days for assembly and testing before ship date. I notice that's a Gibbz (or Gibbz-type) upper. Copyright 1996-2023 AR15.COM LLC. 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. If your mag catch is at Spec height, you should not have a problem with an M4 cut barrel in a rifle receiver. An older-version (or A2-style) feed ramp is cut only on the barrel extension itself (top). Well, over the course of 5,000 rounds at .40 a round, you spent two grand on ammo. DSA has fat top, Mueller, non feed ramp uppers for $40. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. I'll probably build a pistol out of this one. Seems like it should work to me, but be a real challenge to keep clean and be damned ugly to boot. The M4, and the CAR-15, before it have had similar problems like the ones you mentioned. Add M4 cuts to Barrel Ext $15.00 We can modify your rifle extension to match the M4 cuts in an upper receiver. The ramp angles are different and changing the profile of the extension doesn't make it something it isn't. 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. 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. Thanks for explaining the feed ramp topic in a couple of different ways. Seems counter intuitive to recommend an M4 cut upper, especially if the barrel Im looking at has the rifle feed ramp (not M4 cut). 16" Pre-Ban M4 Profile Barrel Assembly CARBINE Gas System About Upper assembly comes completely head spaced and test fired. 4. Looking For Bear Creek Arsenal Barrels Review? So, I had purchased a 458 upper. You cannot paste images directly. Married pretty well with my Seekins machined lower. Paste as plain text instead, Thats why AR10s- And Scar heavies exist for. If this is your first visit, be sure to The Mission of Cheaper Than Dirt! 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. Full M4 feed ramps start on the upper and continue onto the barrel extension. True, which is why they're not even needed in semi autos. 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. Some suggest taking a grinder to the extension area. FN AR15 barrels are hammer forged using the same proprietary high-grade Chrome Moly Vanadium steel used in FN's venerable machinegun barrels produced to handle the punishment of . 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. $101.95. Powered by Invision Community, M4-style barrel extension with Rifle-type upper. No feed ramps. Please be respectful of others. I put together a second AR9 that is having a feeding issue, even if using similar parts as the first one.
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