Mortar 82mm M69A

The M-37 or 82-BM-37 (батальонный миномёт) is a Soviet 82 millimeter calibre mortar designed by B.I. Szayrin and accepted into service in 1937. The design of the M-37 is based on the earlier French Brandt mle 27/31 mortar with Russian modifications.[5] The main difference between the 82-PM-37 and the earlier 82-PM-36 was the adoption of a round base-plate, revised traverse/elevation controls, simplified sights and spring-loaded shock absorbers on the bi-pod to reduce the amount of relaying needed between shots.[6] The German designation for captured M-37 mortars was 8.2 cm GrW 274/2(r).[7]

The M-37M is an improved version with lighter base plate and a device to prevent double loading.[8]

It was produced in China by Norinco as the Type 53,[9] in Egypt by the Helwan Machine Tools Company as the Model 69 and in Bulgaria by Arsenal as the M-82 Mod 1937.[6]