#MAC 10 9MM METAL MAGAZINE FREE#

вЂ‹вЂ‹Glock magazine-equipped ARs typically have neither an overshoot stop nor a feed ramp (we do not feel that slightly counter-boring the chamber entrance of a 9mm AR barrel constitutes a legitimate feed ramp) and instead rely on the magazineвЂ™s positioning within the receiver to ensure direct feeding into the chamber.

A feed ramp to guide the cartridge from the magazine to the chamber.

#MAC 10 9MM METAL MAGAZINE FREE#

Single-column feeding magazines tend to вЂњpopвЂќ their rounds free rather than sliding them out smoothly, and an overshoot stop guides the nose of the round back downward when it might otherwise overshoot the chamber. small arm or nub right above the entrance to the chamber. If you look at a quality pistol caliber carbine (PCC) that was developed from the ground up to use pistol magazines, such as the Beretta CX4 or Ruger PC9, youвЂ™ll notice a few common features: Reason #2 вЂ“ Almost all Glock magazine-equipped ARs lack an overshoot stop and a feed ramp All totaled, these mags are a pain to load without some sort of loading tool. The top round must be pushed down manually before the next round can be loaded, and on top of this, engineers compensate for the binding at the top of the mag by using a very strong magazine spring.

Note:В Another unpleasant side effect of double-stack single-feed magazines is that they are very difficult to load by hand. 45 ACP (according to Ian of Forgotten Weapons in the first 2-3 minutes of this video on the CMMG Banshee) and even lower in a 9mm, but itвЂ™s also unavoidable in any single-column feeding magazine, such as a Glock magazine. This type of malfunction is uncommon, around 1-2% in a. 45 ACP ARвЂ™s violent bolt motion after high-speed camera footageВ revealed that Glock magazine feed lips would occasionally lose their grip on the top round and cause a stoppage. CMMGвЂ™s rotary-delayed blowback action was designed, in part, specifically to reduce a prototype. In a long gun that is mostly immobile due to its greater weight and the presence of a shoulder stock, however, the violent bolt motion of a straight blowback action (common in pistol caliber carbines) can sometimes pop the round partially or completely free of the feed lips, causing a stoppage. In a handgun this isn't a big deal, because the shooterвЂ™s hand flexes and the gun moves under recoil, both of which softenВ the inertia of the movement and keep the round seated in the feed lips. Single-column feeding magazines have less grip on the top cartridge, which makes the rounds more prone to popping partially or completely free of the feed lips and causing a stoppage.However,В at aroundВ 16:30В the gun's sheer dirtinessВ starts to cause hang-ups on the top round from each new magazine, and we'd bet good money that an easy-feedingВ subgun magazine would have been more tolerant. Additionally, this video shows a slower-cycling 9mm AR using factory Glock magazines toВ churnВ through 5000+ rounds on full-auto without too much fuss, at least as far as feed rate is concerned.

See this videoofВ a Glock 18, where at about 1:40 Larry Vickers warns viewers that 33-round Glock magazines often experience stoppages around halfway through a full-auto mag dump. Reduced maximum feed rate is typically not an issue for civilian semi-automatics, which are usually kept clean and only asked to feed a single round per trigger pull, but for quick-cycling full-auto weapons used out in the wild, it can be a problem. Rounds tend to bind up in the transition from double-column in the lower magazine to single-column at the top for feeding, especially at high cyclic rates or when dust/debris gets inside the magazine's already-crowded interior (hence the low-friction PVD magazines with internal sand grooveВ that became necessary once the similarly-designed Beretta M9/92 magazines started seeing extensive desert use).

Single-column feeding magazines are less dirt-tolerant and have a lower feed rate.

Therefore, a single-column feeding magazine allows for a slim, manageably-sized handgun, but it also comes with unavoidable design compromises: The feed ramp for a double-column feeding magazine needs to be roughly as wide as the magazine feed lips, and while thereвЂ™s plenty of room in a submachine gunвЂ™s breech, the same is not true of a handgun. The reason for this is simple: double-column feeding is better, but single-column feeding takes up a lot less space. Virtually all double-stack pistol magazines use single-column feeding (the FN Five-SeveN and Russian Gsh-18 are two rare exceptions) and virtually all submachine guns use double-column feeding (the H&K UMP-45 and the MAC-10 are two rare exceptions).

Mac 10 9mm metal magazine