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You can post now and register later. 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. And that is the important thing! Add M4 cuts to Barrel Ext $15.00 We can modify your rifle extension to match the M4 cuts in an upper receiver. Avoid Polishing Too Lightly Or Too Roughly 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! Would not feed to save its life! 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. Don't forget read more information about it here! Ideally both. Im an old vet, now retired and looking to build some ARs as a hobby to keep me doing something that I will enjoy. 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. Check often for fit. True, which is why they're not even needed in semi autos. I don't have much to add re: feed ramps, but. That puts the cartridge in a position where the extended feed ramp improves the breech-loading design. This is why you can use a barrel with an extension with M4 feedramps with a receiver that does not have feedramps, but you cannot use a receiver with M4 feedramps with a barrel with an extension with rifle feedramps. 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 (they're lowered). *Must have a registered ARFCOM account to win. I recommend putting any AR-platform firearm together with a matched M4 barrel extension and upper receiver set, just because you can. 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. They provide a lower, wider, and smoother entry for any round of ammo, whether its necessary or not. You can put a M4 barrel and non-M4 receiver together, but you can't mismatch them the other way. Create Account; Log Out ; Log In ; Wishlist 0; Shopping Cart 0; Home; About 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 . Thanks. Read Now. M16s and M16-A1s run at 750 rounds per minute in full auto. In most cases the ramps only help during full auto mode while cycling at a high rate. By Upload or insert images from URL. I bought a .458 upper to go with it, with the extra internal clearance cut before anodizing. I picked up a side charging upper from Sundevil last year. Barrel Length: 16" Barrel Material: 4150V Chrome Moly Vanadium Steel Barrel Finish: Phosphate Barrel Profile: M4 Chamber: 5.56 NATO Twist Rate: 1 in 7" Extension: M4 Gas System: Carbine-Length Gas Block Type: Low Profile .750" Diameter Upper Receiver: Forged 7075 T6 Aluminum Receiver Style: M4 Flat top with feed ramps Receiver Finish: Hardcoat Anodized JavaScript is disabled. The extension is the part at the end of the barrel that fits inside the upper. 308 m5 using m4 feed ramps, which I belive are for the smaller round like. So, what is the difference between M4 feed ramps and regular ones? 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. The only one I found is LaRue's upper, but it won't work with the hand guard I'm using (Geissele MKIII). Theres a bit more to it than just polishing. 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. "C" stamp and CAGE code available. So there's a lot more going on with rounds bouncing up and down in the mags etc. Its highly recommended to put any AR-platform firearm together with a matching M4 barrel extension and upper receiver set. I didnt think anything about it having M4 feed ramps. BUT if you find someone to grind your feed ramps and they do a good job, post it up and let us know. Barrels are Douglas 416 stainless steel with 1-7 twist with M4 feed ramps Feed ramps on barrel extensions are a good example. The barrel Throat is the second most critical component after angles and should be polished with utmost care. As a result, the factory machined M4 feed ramps on the receiver are hard coat anodized which adds significant strength to the aluminum. 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. If you have an account, sign in now to post with your account. Mind shooting me a link where I can pick on a C marked A1 carry handle for $150? pictures would help. AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. It's an interesting question. That's an important thing since without the feed ramps, issues can arise when receivers and barrel extensions are mismatched. All Rights Reserved. again, Thanks. All we do is dremmel it to match - we dont remove it and grind to any specific angle. The last is using the best and right ammo for the job. The closest brand new barrel you are likely to find is the Windham Weaponry 20 inch 1/7 twist chrome lined barrel. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Anything else you want to share about M4 clones would be appreciated, especially when it comes to a reliable rifle. 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. Reddit and its partners use cookies and similar technologies to provide you with a better experience. I cant advise on that one folks. Press J to jump to the feed. 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). As suggested, its best to match the upper and barrel extension no worries that way. The good idea is that the round, presented at a lower plane, will contact other lower feed ramps and go right on in. 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. Feels like a silly question now that it makes sense. 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-. Guess what? Other selections are available for upper, bolt and carrier, charging handle, handguards, flash hiders, and gas blocks. I built the upper using a Mega upper with a Compass Lake 18" barrel. What is the difference between Modern, Performance, and Premium Series Barrels? Rear side of a CZ-75B pistol barrel showing the (here dirty) feed ramp. 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). Its easier to add feed ramps to the receiver not so easy to add them to the barrel extension. if you are OK with 3MOA, you might go 20,000 rounds! Is it worth the extra 50 bucks?" Costs about $40-50 to have the feed ramps reprofiled from what I can gather. so it is better to have an upper reciever that's designed for non-m4 feed ramps since you can put in standard barrels right? The M4 style feed ramps and barrel extension provide consistent feeding and the matte black Manganese Phosphate finish resists external corrosion and oxidation. So, lets glide down these lines below to erase your misconceptions about them. 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. M4 can better explain their benefit, although they help with more reliable feeding. 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. It is removeable with a special wrench and a barrel clamp/vise. Is it kosher to add M4 feed ramps to a standard upper to match an m4 ramped barrel? EDIT: Okay, I understand now! In case My barrel is rifle ramp it won't be so bad after all. Feed ramps being m4 or. Thank you for answering the question do well. The ramp angles are different and changing the profile of the extension doesn't make it something it isn't. All uppers are assembled cleaned and tested before shipping. 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. 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. By using the M4 feed ramps for your firearm, you could pick up an increased percentage of the rounds, and feeding reliability would be improved. This has been my concern with modifying the aluminum parts. Buy AR 15 16" .350 Legend Nitride M4 Profile Barrel 1:16: GunBroker is the largest seller of AR15 Parts Gun Parts All: 974000728 . If this is your first visit, be sure to You want them to match. The barrel extension and the receiver both have to have the cuts. Home Firearms Figuring Out Feed Ramps. 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. I wouldn't be concerned at all with any wear after modifying an upper receiver. 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 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. Any body need a anchor for a very small boat? [ARCHIVED THREAD] - M4 feed ramp barrel in a non M4 ramp upper. Looking For Bear Creek Arsenal Barrels Review? well.. it's kinda hard to get stuff in this part of the world. One new winner* is announced every week! Additionally, in this increasingly specialized world of AR-15 parts that we live in, there are proprietary feed ramp cuts used for some alternate cartridges, such as .458 SOCOM. For a better experience, please enable JavaScript in your browser before proceeding. 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. 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. We reserve the right to edit as appropriate, delete profane, harassing, abusive and spam comments or posts, and block repeat offenders. With the bcg moving that much faster, the magazine springs were having a hard time supplying the rounds fast enough, AS WELL AS the tips of the rounds were digging into the feed ramps and catching. Description Genuine 14.5" SOCOM, carbine length gas system barrel from Colt. 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 Either way is good and both types work great with semi auto only guns. JavaScript is disabled. M4 Feed ramps on barrel extensions are a solid example. If you consider this article useful, share it with anyone in need! Ready to drop onto a complete lower receiver. 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. Feedramps, proper staking of castle nuts, forward assist (yep went there)S-happens seen it. Bear Creek Arsenal Barrels - 6.5 Grendel Type 2 Barrel This Gorilla Machining AR-15 16" heavy Black Nitride 6.5 Grendel barrel has a Carbine length gas system with a 1:8 twist. . Paste as plain text instead, I got my help from this thread, and thank you again to ORD. I notice that's a Gibbz (or Gibbz-type) upper. 5. Shorter length equates to much higher pressure in the upper receiver. Damaged Ak front end Barrel in Trunnion with or without sight bases. Reliability is the main concern for me when I re-barrel this rifle. I found the article very informative. Questions on how to install your new BA barrel? 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. They offer a lower, more extensive, and smoother entry for any round of ammo, whether its necessary or not. Go back to writing school. Single Action and Double Action Which One Is Better For You? 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.