Our 6mm ARC barrel come standard with 1-7.5 Twist, M4 Feed Ramps and gas tube. Clear editor. 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 . Also, barrel life is relative. The M-16/M4 are great weapons. 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. M16s and M16-A1s run at 750 rounds per minute in full auto. AAC and anybody else that has any reasonable expectation of quality and reliability use an M4 feed ramp. 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. It has 2 ramps cut into the receiver to help the rounds feed into the chamber. The rifle receiver, doesn't have ramps on the receiver, they are only cut into the barrel. To measure just where the round makes impact on the feed ramps, I did not use any sort of micrometer to measure. Thats receivers, bolts, and on down the list of the 100 or so parts that can make up an AR-15. I'd rather not spent the money to get it cut to the specific length I need, FSB installed, etc just to have it immediately not work and have to sort out then or start from square one with a new barrel. Seems like it should work to me, but be a real challenge to keep clean and be damned ugly to boot. 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. I'm planning on replacing my forearm with a Larue 13.5. I'm assuming that you only need the ramps from one or the other. M4 ramps help in feeding in for carbine in full auto. 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. The ramps on the regular rifle-type extension are cut just to the edge of the extension. 4. That is what I tell people when they try to convince me that they need a stainless barrel instead of chrome-moly. So I'm working on my first build, and I'm a little confused. Jams and misfires. Full M4 feed ramps start on the upper and continue onto the barrel extension. 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 But, as with anything else, this work can go too far. 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. Ok, So, in short, I've got a barrel on my Armalite upper (with M4 feed ramps in the upper) that has standard AR-15 (non-M4) ramps. 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 The good idea is that the round, presented at a lower plane, will contact other lower feed ramps and go right on in. Little polish. upper recievers and barrels are hard to comeby. Recommend using a gunsmith this route too if you are not comfortable. That's an important thing since without the feed ramps, issues can arise when receivers and barrel extensions are mismatched. Married pretty well with my Seekins machined lower. Other selections are available for upper, bolt and carrier, charging handle, handguards, flash hiders, and gas blocks. Sent back again. So I'm thinking I ought to have M4 ramps in the gun because based on what I've read: Rifle receiver+M4 barrel = "OK" but not ideal. Then you can get a regular rifle barrel for the upper with no ramps. I will attest that a rifle upper and a barrel with the M4 feedramps works just fine. I had seen these pix years ago and dismissed the idea of mix and match. Here you can see an upper with "rifle" feedramps. FN AR-15 5.56X45mm Nato . If it's happening regularly, check the magazines you are using for serviceability. You are using an out of date browser. Whether they materialize or not depends on the direction of the mismatch. I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. You have a rifle barrel. Brevity matters. BUT, I DO NOT TRUST MY LIFE TO THAT WEAPON. Factory said its fine . Add 3% to the total cost for credit card purchases. The closest brand new barrel you are likely to find is the Windham Weaponry 20 inch 1/7 twist chrome lined barrel. are all barrels w/ m4 feed ramps?? from my service in the 70s to my personal weapons, all of my ARs are early 1970 slab sided Colt SP1s. In most cases the ramps only help during full auto mode while cycling at a high rate. Don't forget read more information about it here! The difference between standard feed ramps and M4 ramps is easy to see. You must log in or register to reply here. Its a miracle! Man, its crazy how many of yall have absolutely no idea why you do what you do. A forum community dedicated to drag racing drivers and enthusiasts. The M4, and the CAR-15, before it have had similar problems like the ones you mentioned. Im an old vet, now retired and looking to build some ARs as a hobby to keep me doing something that I will enjoy. So I called. Some argue that, factually, its a step to enable a smoother feeding. Feeds flawlessly. Higher pressure equte to parts (bcg, buffer, buffer spring, ROUNDS, etc) experiencing much higher wear/tear. so im thinking I might as well just get the unramp upper. 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. I'd rather just pay the gunsmith to make it work than hunt down another barrel/upper if possible. 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. Add M4 cuts to Barrel Ext $15.00 We can modify your rifle extension to match the M4 cuts in an upper receiver. Having been in military supply, I know that what the mil-spec means: it gets the minimum job done for thousands (millions) of parts/systems. 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? Your link has been automatically embedded. So like ORD says it is entirely 100% possible and plenty of people do it, but I would rather not do any work to this perfect barrel. AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. can you buy feed ramps individually? They aid in feeding the round into the chamber from the magazine more easily, which make uppers and barrel extension matched. Now, theres nothing wrong at all with a little polish on any and all feed ramps, which can not only be done fairly easily, it can be successfully done by most at home. We want you, our readers, to be able to make informed decisions. A feed ramp is a basic feature of many breech loading cartridge firearm designs. Barrels are Douglas 416 stainless steel with 1-7 twist with M4 feed ramps 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 M4 16", SBN, 1:7, 5.56 NATO Barrel Specifications: - Caliber: 5.56 NATO (.223 REM) - Gas Tube: Car Add to Cart. Thats true overall and good to keep in mind. 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. 5. Press question mark to learn the rest of the keyboard shortcuts. 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.) . Do you have an AR barrel or feed ramp tip? I will check with compass lake. Forged 7075-T6 aluminum is harder than a bulls balls. ago Costs about $40-50 to have the feed ramps reprofiled from what I can gather. You wrote that much to make a point that should have taken about 100 words? if you are OK with 3MOA, you might go 20,000 rounds! Full M4 feed ramps are on both the upper and barrel extension. Previous. Snipers Hide is a community of Snipers of all kinds, focusing on long range shooting, accuracy, and ballistics. 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. Ballistic Performance of Federal Punch .22 LR Ammunition with the Heritage Barkeep #1063. Does anyone have a follow up that confirms or denies my claim? AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. Product Description Surplus Colt 14.5" SOCOM, carbine length gas system barrel from Colt. The ramps are in the barrel extension. 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. Oh well, as I tell my lovely and understanding bride, guns are relatively free. it's the ammo and training that cost real money. well.. it's kinda hard to get stuff in this part of the world. 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? Create an account to follow your favorite communities and start taking part in conversations. . This is one time it's better to go a little too far than to leave an edge for the . So, I had purchased a 458 upper. You absolutely do not want it the other way around however. The A2's are pretty reliable guns, but trashed mags can cause them to have malfunctions also. 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 . Editors Note: This article was originally published in January of 2019. By Yamil Sued August 6, 2021. Not saying a really good gunsmith cant do it, just that theres a bit of an involved process. I can assure you that most mods that deviate from the original design aren't 100% reliable. The upper is designed to have two levels of top rails for mounting of night vision in front of scopes. Only took a few minutes. Metal cases ammunition such as Wolf through an M4 clone? 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. 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. The rifle receiver, doesn't have ramps on the receiver, they are only cut into the barrel. This USGI modification was done to both the barrel extension and the upper receiver, creating a longer and steeper feed ramp. Should not be too hard. 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 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. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Owning Best Ruger SR9c Accessories Can Change Your Life. The M4 receiver feed ramps are cut at a steeper angle and, as a result, extend down into the receiver wall. Would not feed to save its life! "It will last 5k rounds instead of 4k. The ramp angles are different and changing the profile of the extension doesn't make it something it isn't. 's blog. - The Shooter's Log, 2012 SHOT Show Special Report: Del-Ton TRX Rifle and More! . 2. AR9 - Help diagnosing feeding issue. 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. If you ever have an issue, then look at getting a correct barrel for the upper. Any use of this content without express written consent is prohibited. 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. I have seen it done many, MANY times and if done right, it works/functions 100% without issue. 338 and others not the .308 76251 or 6.5 creedmore which o think should have a.30cal feed ramp.? Looking For Bear Creek Arsenal Barrels Review? Looking to spend $180-250 (depending on condition, forge mark and if a rear sight is included or not.) It is milled out of 6061 T6. In military situations, it is advantageous for rifles to function with damaged, worn, or less than ideally serviceable magazines. May 17, 2008 in The Armorer. Reddit and its partners use cookies and similar technologies to provide you with a better experience. /r/ar15 is here for your favorite black gun links, build pics, questions and other tactical or practical information. I wouldn't be concerned at all with any wear after modifying an upper receiver. Feels like a silly question now that it makes sense. M4 Feed ramps on barrel extensions are a solid example. Does it make a big difference? I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. In general, all you need to understand is that the M4 feed ramps include the barrel extension and upper receiver. Create Account; Log Out ; Log In ; Wishlist 0; Shopping Cart 0; Home; About Theres a bit more to it than just polishing. Not all mil-spec features advertised on the product information are the real mil-specs. I've thought about it myself, and I'd like to see test results if any exist, displaying what reliability effect M4 ramps have on other barrel lengths. Only took a few minutes. Your email address will not be published. However Ive built numerous ar15 and lr308 rifles and pistols. Caught a deal on a matched barrel and bolt. Required fields are marked *. We have four combinations here: All this basically means is that the ramps continue from the barrel extension down through the upper receiver tonthe magazine. It's best to use rifle/rifle combo or M4/M4. 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). Its not a big deal but still an important thing to remember and understand. How long your barrel "lasts" depends on what your accuracy threshold is before you decide it is too bad to keep using.
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