Instead, the gas the cartridge produces immediately begins actuating the bolt in the chamber. This is why the AR9 uses blowback: It simply doesn't need a gas system. So, its energy is harnessed at in the firing chamber, providing the force to cycle the bolt as soon as the cartridge's primer is ignited. The 9mm's powder burns rapidly in the firing chamber, and there's simply less of it to burn. The 9mm cartridge was designed for handguns, which have no gas system. Some produce more, and require more dwell time to avoid over-pressurizing the bolt. Some rifle rounds and barrel lengths produce less pressure. This is also why AR-15s have different gas system lengths. This is called dwell time, and it's why gas must first travel down the barrel then back, through a gas tube, before coming back into the receiver. In a rifle-caliber AR, that excess gas must expend some of its energy on the bullet itself as it travels down the barrel, before being redirected to cycle the bolt. This is the only way to achieve the right amount of velocity a rifle round requires. But in a pistol-caliber firearm like the AR9, all that energy would:ġ.) quickly destroy the bolt and trigger group, orĢ.) not cycle the bolt completely in a blowback-operated AR-15. A key atop the bolt traps the gas/piston and allows it to drive the bolt into the buffer.Ī lot of gas when fired, and burning all that powder takes time.The gas/piston travels back into the upper receiver and bolt carrier group.Excess gas travels to a gas port and through a tube or piston.Powder burns in the chamber, accelerating the round.The firing pin hits the primer on the rifle cartridge.The AR-15 uses a direct-impingement system with a gas tube to cycle the bolt: The spent casing is ejected, the bolt drives forward, and a new round is chambered.The kinetic energy of the spent casing drives the bolt back into the buffer tube.That same gas forces the spent casing to slam against the bolt inside the chamber.The rapid expansion of gas expels the bullet from the barrel.Powder burns in the firing chamber and creates gas.The firing pin hits the primer on the 9mm cartridge.That’s because the AR9 usesīlowback to cycle the bolt. Look closely at an AR9 upper, and you won’t see a gas tube underneath the handguard. Except the 9mm variant of the AR platform uses some different parts and functions to provide semiautomatic fire. Since the AR9 pistol and AR-15 appear so similar, let’s compare the two first. ![]() A 9mm-specific buffer is required inside your buffer tube, but we'll touch on that later. The AR9 pistol instead uses a new lower receiver (theĪR9 lower) and a stripped AR-15 upper receiver with a 9mm barrel, new bolt carrier group, and an AR-15 buffer system and standard 5.56/.223 lower parts kit. Converted 5.56/.223 guns use special parts to adapt the factory upper and lower receivers for the 9mm cartridge. But this particular 9mm weapon is not just an AR-15 with a 9mm Parabellum conversion kit installed. The AR9 pistol is a 9mm variant of the AR-15. This is your ultimate AR9 pistol guide! We’re breaking down everything you need to know to build one yourself: What the AR9 pistol is, what separates it from an AR-15, parts compatibility, 9mm Parabellum's ballistics, buffer weight, barrel length, twist rate, and magazines. All data and recommendations in this guide were compiled from real shooters who've built and tested AR9s with different parts.
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