The ASh-12.7 (Avtomat Shturmovoy, Автомат штурмовой in Cyrillic, meaning "Automatic rifle" in English), also known as the ASh-12, is a large-caliber Russian battle rifle.
The weapon is designed by TsKIB SOO, and is manufactured by Izhmash.
The weapon is meant to be used for high-risk law-enforcement environments at short range to prevent mass collateral damage to innocent bystanders or hostages. Because it needs to fulfill these tasks, the ASh-12.7 is made to chamber special high-caliber bullets to fulfill a variety of purposes for various missions. The ASh-12.7 assault rifle has a bullpup layout, with a stamped steel receiver and a polymer housing and stock. It is speculated to use a gas operated, rotary bolt action. Firing controls include two separate levers; a fire mode selector at the rear and an ambidextrous safety lever above the pistol grip. There are several configurations of the basic rifle; such as one with an integral carrying handle and a flat-top version with flip-up iron sights. Certain variations include a picatinny rail at the fore end used for mounting multiple-shot grenade launchers or foregrips. A compensator or a suppressor can be attached to the muzzle.
The ammunition the ASh-12.7 uses is based on the 12.7×55mm ammunition used by the VKS sniper rifle, also developed by TsKIB SOO. It uses a straight-walled, rimless brass case. The standard load for the ASh-12.7 is a lightweight, supersonic bullet with an aluminum core, exposed at the front and hollowed at the rear, partially enclosed into a bi-metal jacket. The cartridge has a bullet weight of 48.14-76.08 grams and a muzzle velocity of 290–315 meters per second. It has several loadings; light loads, heavy loads and even a duplex load.