Type 100 grenade discharger

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Type 100 rifle grenade launcher

The Type 100 grenade discharger was introduced in 1939 as a grenade launcher for the Type 38 and Type 99 Arisaka Rifles. It launches standard Type 91 and Type 99 hand-grenades. The launcher is somewhat unusual in that rather than using the more common cup designs it is a gas trap system, meaning that it incorporates a barrel extension which taps off excess propellant gases to launch the grenade from a cup offset from the barrel. This has the advantage that standard rifle cartridges could be used along with the standard hand-grenades which simplified logistics, at the expense of increased weight and decreased efficiency. The effective range is approximately 100 yards.[1]

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  1. ^ http://www.lonesentry.com/articles/jp_rifle_grenade/index.html Model 100 Grenade Launcher Produced in Two Types" from Intelligence Bulletin, Dec. 1944