M252 mortar

The M252 81 mm medium weight mortar is a British designed smooth boremuzzle-loading, high-angle-of-fire weapon used for long-range indirect fire support to light infantryair assault, and airborne units across the entire front of a battalion zone of influence. In the U.S. Army and U.S. Marine Corps, it is normally deployed in the mortar platoon of an infantry battalion.

The M252 system weighs 91 lb (41 kg) completely assembled and is composed of the M253 Cannon (35 lb, 16 kg), M177 Mount (27 lb, 12 kg), M3A1 Baseplate (29 lb, 13 kg), and the M64A1 Sight Unit (2.5 lb, 1.1 kg). The mount consists of a base plate and a bipod, which is provided with screw type elevating and traversing mechanisms to elevate/traverse the mortar. The M64A1 sight unit (also used on the M224) is attached to the bipod mount. The M252 is a gravity-fired smoothbore system. Attached to the muzzle of the weapon is the Blast Attenuation Device (BAD), used to reduce the blast effects on the mortar crew. To increase cooling efficiency, the breech end is finned; though first-hand accounts attest that the level of cooling is negligible. The cannon also has a crew-removable breech plug and firing pin.

Specifications
Weight 41.3 kilograms (91 lb)
Length 50 in (127 cm)
Barrel length 1.27 metres (4 ft 2 in)
Crew 5
Caliber 81 millimetres (3.2 in)
Elevation 45º–85.2º
Traverse 5.6º
Rate of fire 8–16 rpm sustained
20–30 rpm in exceptional circumstances and for short periods
Effective range HE: 91–5,935 m
(99–6,490.6 yd)
Feed system muzzle-loaded

Source

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