GD-112

The GD-112 (Formal designation: 112식 기관 단총 / 一一二式機關短銃, iriri-sik gigwan danchong, "Type 112 machine pistol;" Short designation 112식, iriri-sik, "Type 112") is a modular submachine gun developed in Menghe. Unlike most other submachine guns, it is gas-operated and fires from a closed bolt with rotation-based locking. These features result in greater safety, accuracy, and reliability. The weapon is primarily used by Menghean special forces, including the Deep Mission Troops, the IIA, and the Internal Security Forces. In Menghean service it is most often chambered in 7.5×25mm +P+ ammunition, but variants exist in a variety of other pistol calibers.

Design details

Ammunition

The service variant of the GD-112 used by the Menghean Deep Mission Troops and counter-terrorism units is chambered in an overpressure loading of the Menghean 7.5×25mm pistol cartridge. This loading achieves 34% higher pressure in the barrel than standard 7.5×25mm cartridges. The increased muzzle velocity results in greater range, accuracy, and armor penetration, all qualities valued by the Special Forces, though it also requires a sturdier and heavier weapon.

In part to avoid incompatible loading of ammunition types across firearms - which would result in poor performance on the GD-112 and dangerous parts failures on the GD-71]] - +P+ loadings of 7.5×25mm ammunition are issued in special magazines not compatible with earlier Menghean submachine guns. Standard service magazines for the GD-112 are built with polymer sides and an aluminum backplate, and use a release notch on the rear of the magazine, similar in layout to earlier Menghean magazines but dimensionally different.

To aid in reloading under adverse conditions, the GD-112's magazine well is "flared" outward by 8 mm forward and backward and 4 mm to each side, guiding a magazine inserted slightly off-angle into the right position. There is also a last-round bolt-hold-open system which alerts the user that the magazine is empty.