Assertion: launcher's base | /r/CapableOf | act as the high-pressure chamber
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Source sentences:
text: Soviet development of an underbarrel launcher for the AK rifle series began in 1966 and in 1978 produced the GP-25, a muzzle-loading device for the AK-74 rifle using a mortar-like grenade round which functions by venting its propellant through holes in the base; this is a variation of the high-low system used by Western rounds, with the base of the projectile acting as the high-pressure chamber and the launcher's barrel acting as the low-pressure chamber.