B-11 recoilless rifle

The B-11 recoilless rifle (It is also known as RG107) is a Soviet 107 mm smoothbore recoilless rifle. It entered service in 1954, and was typically towed by a 6x6 ZIL-157 truck or a UAZ 4x4 truck.

Designed by KBM, Kolomna.

It is fitted using a PBO-4 sight which has a 5.5x zoom direct fire sight and a 2.5x zoom sight for indirect fire.

Specifications

 * Crew: 5
 * Calibre: 107 mm (4.21 in)
 * Weight: 304.8 kg (672 lbs)
 * Length: 3.56 m (11.67 ft) (travel position).
 * Barrel length: 3.383 m (11 ft)
 * Height: 1.19 m (3.90 ft) (firing position). 0.9 m (3 ft) (travel).
 * Traverse: 35 degrees in each direction
 * Elevation: -10/+45
 * Rate of fire: 6 rounds per minute

Ammunition

 * BK-883 - HEAT. Projectile 7.51 kg (16.5 lbs). Complete round 12.5 kg (27.5 lbs). Warhead 1.06 kg (2.3 lbs) of RDX/Aluminium. GK-2 PIBD fuze. Range: 450 m (494 yds) (effective) 1,400 m (1,531 yds) (max). Penetration 381 mm (15 in). Muzzle velocity
 * O-883A - FRAG-HE. Projectile 8.5 kg (19 lbs). Complete round 13.5 kg (30 lbs). Warhead 2.088 kg (4.6 lbs) Amatol 80/20. GK-2 PIBD fuze. Muzzle velocity: 375 m/s (1,230 fp/s). Range: 1,300 m (1,421 yds) (direct) 6,650 m (7,272 yds) (indirect)

Users
The weapon was used by Bulgaria, Cambodia, China, East Germany, Egypt, North Korea, North Vietnam and Poland.