New posts Search forums. The problem with M4 is that it's like the weapon version of the survivalist: mediocre at everything and thus good at nothing. There is no shining point where you can point to the M4 and say "The M4 is the best at this". Every aspect of the M4 is outclassed by some other shotgun. AA12 is better against trash AA12 has a bigger magazine Unlike our standard AR15 Assembled Upper Receiver, this specific model does not have machined M4 feedramps. - 20" barrel with A2 type birdcage flash hider, and chrome lined bore. Only show this user. I have a Mega Billet upper and lower set on order. This OEM manufacturer makes receivers for many other brands from quality forgings, like Anchor Harvey forgings (aka split-A), Cerro (aka keyhold forge), Brass Aluminum and Mueller. I have heard that normal feed ramp barrels do poorly with such recievers. Fast, Free Shipping on Orders over $50 90-Day No-Hassle Returns. Helps dissipate heat for cooler operation, too. There are (and have been for years) several manufacturers making A1 uppers that have M4 feed ramps, as well as the brass deflectors. Now if your barrel has standard rifle ramps, DO NOT get a receiver with M4 ramps, as JonM said. For me, I am a believer. Reviews (1) Our barrel feed ramp polishing service is meant to improve the feeding step of the cycle of operations. The BCA barrels do not have as nice of a finish. If you have feeding issues, Dremel out the middle of the M4 feed ramp, and it’s likely any feeding issues you are having will disappear. The only thing is that it has extended M4 feed ramps. Bushmaster, DPMS, Rock River all gave me a thumps down for such feed ramps on their barrels. If barrel manufacturers delivered a single large feed ramp and 1/8″ gas port hole in the barrel, almost all the issues would be resolved. The result is that the ramps in the M4 receiver have an overhang from the barrel … NOTE: The Barrel MUST be removed from the Upper receiver for this Service to be performed. Early feeding issues in the M4 necessitated a modification in the upper receiver and barrel extension. This will address the gap where the upper receiver and the end of the barrel meet. M4 feed ramps allow the tip of the round to strike into the receiver / barrel extension of the rifle and still ride up into the chamber. Parts must be inspected and tested by a qualified and competent gunsmith or armorer before use in a firearm. To compensate for the shorter gas tube, the M4 also has modified feed ramps. Handguard – 2 Piece Carbine. The M4 is extensively used by the United States Armed Forces, with decisions to largely replace the M16 rifle in United States Army (starting 2010) and United States Marine Corps (USMC) (starting … -Hardcoat Anodized per MIL-A-8625F, Type III, Class 2 Finish. The military made the modification to the M4 because it was having feeding problems during full auto fire. -1913 Picatinny Rail. It is chambered in 7.62×39 with an M4 feed ramp and a 1 in 10” twist barrel. Machined from billet 7075-T6 aluminum vs. the more commonly used 6061 for a 70% increase in strength. The BSF 9mm AR barrels are not cheap, but they are extremely effective in their intended roles. $124.00 MEGA ARMS GATOR FORGED LOWER, WITH M4 FEED RAMPS UPC# 811338034953 11 in stock +-Add to cart. Black Hard anodized with a surface hardness of 60 Rockwell. Melonite is similar to nitride treatment, as previously discussed. These represent good ramps. A feed ramp is a basic feature of many breech loading cartridge firearm designs. To repeat the above, you CAN use barrels with M4 feedramps on your upper without, just not the opposite (upper with ramps, barrel without). The Feed ramps on the cheap $72 dollar barrel are pretty rough. You just need to make sure that the upper receiver has M4 feed ramps in it. A semi-auto gains no real benefit to M4 ramps, the same is true for a 3 round Burst M16A2 which doesn't have M4 ramps. and stick with p-mags which position the round high enough, so ramps don't seem to matter, in my experience … All flat top receivers (with maybe a hand full of exceptions) should have M4 feed ramps in them. The stainless pistol length gas system will cycle subsonic rounds as was expected. 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.The feed ramp may be part of the magazine (), part of the receiver or frame (), or part of the barrel ().Some firearms, like the FN Five-seven, have a beveled … It is chambered in 7.62×39 with an M4 feed ramp and a 1 in 10” twist barrel. You have the standard that was there with the beginning of the AR-15, M-16, M-16A1, A2…all the earlier guns when you had a full-sized barrel. Barrel Threads – Mil-spec 1/2-28 UNF. The floor is yours…. Well, its only like $15~25 more to have M4 feed ramp. Firearm & Feed Ramp Polishing Kit - What's Included: 1/2oz can of Non-Abrasive Firearm Polish. As the photos show there is a step that has developed nicks on the barrel extension and upper interface. However a good polish job made them so slick that it doesn't matter if the bullet smacks straight into the ramp. - Colt manufactured 20" A2 style barrel, 5.56 NATO with M4 feed ramps and 1/7 twist rate. Longer feed ramps were machined into both surfaces, therefore, providing a more gradual transition from magazine to chamber. 1 Microfiber Towel. The carbines had more pronounced ones than the rifles and the m-4's were even more pronounced. Not M4 feed ramps. M4 feed ramps can have a noticeable gap that can effect the bullet tip as it slams into battery. Complete barrel assembly features M4 feed ramp, barrel nut, fixed front sight tower with sight post, and is threaded 1/2-28 for your choice of muzzle device. The differences between the two are extremely small. It may not be as fast but all you really need to do is get everything smooth.The smoother the feed ramps the less amount of friction the cartridge works against on it way into the chamber. Either one of the two fixes woukd have solved the propblem but bothe were adopted. Start your project with our A1 stripped upper receiver with M4 Feed Ramp. To measure just where the round makes impact on the feed ramps, I did not use any sort of micrometer to measure. This carbine gas DPMS does not inculde any M4 feed ramps, which is better than having ramps crudely cut in. So the question is are M4 feed ramps. I have a Mega upper and a Compass Lake barrel that I assembled. Featuring M4 feed ramps, this upper receiver is machined to Military Specifications & Standards and can be used with multiple calibers on the AR-15 platform. All Parts U.S. Made By DS Arms! AR-15 feed ramp issues. 16″ A2 Sight Tower Upper M4 Carbine Length Chrome Moly Nitride Processed. Gas Block – Military-spec Front Post. The last photo of extension is one of my ar15s. I talked to a guy that I used to work with who was in the military and he told me that he even had problems with 30 round mags w/ hollow points. 9.4 oz. In proportion with the shorter barrel, the M4 has a shorter gas tube. Yes, in short the AR-15 is the civi version of the M-16 while the M4 is the Carbine version of the M-16. Unlike the A3, the A4 has M4-style feed ramps to complement the feed ramps on an M4 barrel. The first thing to understand is that the angles of the frame and barrel ramp…aka “Feed Ramp and Barrel Throat” are critical, with the former being the most critical. To solve this problem, M4 feed ramps must be adjusted and improved to ensure the proper operation of the next level. CALL FIRST! Expect delays on all purchases. His barrel extension has M4 feed ramps (deep cut, not like rifle ramps). -Forged 7075-T6 Aluminum Material. The 16” HBAR is made of 4150 V chrome molly and is melonite treated. M4/M4 is clearly correct. Quality M4 upper receiver with M4 feed ramps without T-engraving. M4 feed ramps fall into the "nice but not necassary" category. This led to a lot of problems on the one Stag I have owned, a 6.8SPC model 5H. Description. Our 6.5 Grendel barrel come standard with 1-8 Twist, M4 Feed Ramps, .750 gas block. 31 August 2009, 11:50 #2. bigcoastie. M4 is a fully automatic firearm that uses shorter handguards with shorter barrel length, while an AR-15 is semi-auto and uses longer handguards with longer barrels. What’s hot on Task & PurposeA Marine was asked ‘how many people have you killed?’ His response was perfectAbandoned Air Force base with underground tunnels posted for sale on FacebookAir Force maintainers are getting new ‘janitor grey’ coverallsThe Marine Corps is officially flying its ‘most powerful’ helicopter everMore items... I have a 14.5" barrel with m4 feed ramps and recently had a comp pinned on, gas system has been installed and it has been torqued onto the upper. New Posts. Although, there are no clear drawbacks to using m4 feed ramps on rifle length gas systems. LaRue Tacticaluppers do not use M4 feed ramps and had some pretty valid reason for not using them. The AR15 Assembled Upper Receiver is one of our most popular products. This is one of the hardest Barrels to find.. and so many different Builds can be made with this Barrel (Xm177E2, Gau-5, Colt Commando, model 733, etc). If you look at the notches, the difference is easy to see, they are deeper and go allt he way down. You won’t be using a grenade launcher. Chamber – .223-5.56 , M4 Feed Ramp (Shoots both .223 and 5.56) Barrel Steel – Chrome molly stress relieved. But just like full auto bolts vs. semi-auto bolts they have no impact on the function or reliability of a semi-auto rifle. What's new. So I'll go with it. -Machined In T-Marks. Here is a link to finding "The Best AR". I ask because I just received my upper and I it was supposed to have the M4 feed ramps but there are barely 2 little divots. The mindless milspec minions have to have them because, well, its not milspec without M4 feedramps. As you can see, there is very little difference between the two options. Polishing increases feed reliability no matter the bullet cartridge combination. Barrel Only, no other Parts. I thought it was supposed to be a more pronounced groove. New Posts w/o WC. I’d … wish I had a link to the article. The M4 carbine is a 5.56×45mm NATO, gas-operated, magazine-fed, carbine developed in the United States during the 1980s. Why polishing the feed ramp on a Government Model is a bad idea. yes they are all m4 feed ramps in barrel and upper also I bought the mags all reconditioned with all new internals they are pre-ban. Melonite is similar to nitride treatment, as previously discussed. Stags have no M4 feed ramps. Upper receiver comes stripped without ejection port cover, forward assist or rear sight. 1 Pair of Black Nitrile Industrial Strength Gloves. Maybe wider than m4, for the larger cartridge? I have a bit of a dilemma. My understanding is that in very rare cases you can end up rounds jamming in the sharp lip formed in the gap between receivers M4 ramps and the barrels "rifle" style ramps. The M4 design resulted in a BCG with an extremely high cyclic rate. This worked fine with the relatively lower pressure rifle gas system and its more moderate cycle rate. If I was building or buying a 16″ upper, I would not go with the carbine length gas system. View Forum Posts. *Cut M4 Feed Ramps & Polish Feed Ramps and Barrel Extension Lug Recesses $75.00-$150.00 Labor. M4-type barrel extension has NiB-X finish that aids in smooth locking and unlocking with the bolt, consistent feeding and helps prevent hang-ups. Polishing increases feed reliability no matter the bullet cartridge combination. I eventually ditched it for an upper from AR Performance, a 6.8SPC specialty shop. . If you have feeding issues, Dremel out the middle of the M4 feed ramp, and it’s likely any feeding issues you are having will disappear. Modern M4s will have a flat-top receiver with a 1913 optics rail, but some very early models can be found with old M16A2 uppers. Features specific to the M16A1 Upper Receiver are the original A1 profile, with no shell deflector, A1 rear sight housing and proper carry handle contours. Quick view. By John Travis. However a good polish job made them so slick that it doesn't matter if the bullet smacks straight into the ramp. 659. In full disclosure, I had already cut the M4 feed ramps out, and polished it down to one large ramp for the 30 cal round. Conclusion: AR-15 Barrels When you’re looking to improve the accuracy, reliability and durability of your weapon, any one of these five best AR-15 barrels will get the job done right. BSF Barrel, No Handguard. Forged from 7075-T6 aluminum, this assembled upper is precision machined to mil-spec M16/M4 specifications. Finally, you can polish the feed ramps. For a civilian the two barrel profiles will work out the same. This high-tech coating lasts the life of the weapon, and won’t rub off, flake off, or gall. Engineers introduced longer feed ramps that carried into the lower receiver and the M4 feed ramps were born. M4 refers to long ramps as seen on M4A1 full auto. (We’ll overlook for the moment that the front sight is probably also a problem, but that’s a different chapter.) I don't know if that helps at all, but it's cheap, and can't hurt to try if it's not an ammo issue. Product Videos. So the feed ramps are only are cut into the barrel extension. The standard m4 ramps are just a tiny bit narrow and steep for a round nose bullets. With a 1:7 RH twist rate, the EuroOptic FN AR-15 HF Barrel also offers a 1/2×28-inch threaded muzzle and an M4-style feed ramp extension to offer reliable and consistent feeding. Add in some dedicated 7.62×39 magazines and you are good to go. Comes with the standard features of a Mil-Spec upper receiver and is forged from 7075-T6 aluminum with a black hard coat anodized, tough finish. M4 feed ramps occur from the receiver on into the barrel extension. M4 feed-ramps help ensure reliability with old, crappy magazines. You won’t be using a grenade launcher. Click now to learn more. You have the option of barrel type, thread, fluting, finish type and to add a matched bolt. Details. These do have M4 feed-ramps. Bear creek barrels are parkerized. M4 feed ramps were developed for the military’s select fire M4. that said, collapsible stock configurations are widely available for the AR-15. Posts. The BCM rifle above mentions M4 feed ramps on both the barrel and the upper receiver. A2 vs M4 feed ramps for my upper? There are many, many other options, so a well-equipped BMW M4 can easily jump to $124,500. If we compare the base price of the new BMW M4 to that of the two direct competitors we notice the Audi RS5 is the most expensive, with a starting price of $ 104,475, while the Mercedes-Benz C63 AMG Coupe has a closing price to that of the M4.
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