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120 mm WP smoke bomb, M929/M929A1
Region
United States
Category
Ammunition, Missiles and precision weapons
Armament M120 and M121 120 mm mortar. Development The XM929 entered low-rate initial production in May 1992 and was type classified as standard (M929) in June 1996. The M929A1 is identical, but uses the XM734A1 Multi-Option Fuze (MOF). The US Army purchased 64,000 rounds in FY00 and 15,000 rounds in FY01. Overall unit cost in FY01 was US$1,622, but if non-recurring costs (mainly related to material changes in training equipment and the ignition cartridge) are excluded, the hardware unit cost was US$880. The main
elements of the cost are the load-assemble-pack operation by Pine Bluff Arsenal (US$226), the metal projectile bodies from Chamberlain (US$189), the M86 burster from American Ordnance (US$25), and the M734A1 fuze from KDI (US$225). Description The round consists of a fuze, propellant charge, fin assembly, ignition cartridge, and shell body. The shell body, made of wrought carbon steel, is loaded with WP filler. The filler consists of 144 felt wedges impregnated with WP, which burns immediately on contact with air. The wedges burn for approximately 2 minutes, creating a smoke that is twice as effective as the 107 mm, M328A1 round. The ignition cartridge has a percussion primer and is assembled to the end of the fin assembly. The propellant charge is contained in four horseshoe-shaped felt-fibre containers and assembled around the fin assembly shaft.