Importance

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Abstract

This low impulse payload cartridge for automatic weapons includes a case, a piston, an ogive, a payload cup, a payload, and a link. The payload cup and payload is seated into the forward portion of the piston. Gas passages permit propellant gases to bleed into the cavity behind the payload and to accelerate the payload upon firing. An alternative to using bleed gases is to use a separate propelling charge behind the payload. The case and piston are assembled and telescopically secured by means of a crimp or other similar feature, to allow relative movement therebetween during chambering and firing. The link may be allowed to move for some portion of the required relative travel between the link and the base of the case. A shoulder on the piston provides a stop through which reaction loads are transmitted to the rear of the barrel during chambering and firing. The piston telescopes over the case during chambering to provide the relative movement between the link and the case base required for weapon function. The relative movement between the piston and the case also allow the payload cup to be forced through the end of the piston. Upon firing, the expanding propellant gases force the case and piston to telescope open. Propellant gases are also used to expel the payload. Reaction loads are applied to the rear of the barrel through the shoulder, and at the same time are applied to a bolt, driving it rearward to cycle the weapon. The cartridge can be used in automatic weapon systems including but not limited to the 40 mm MK19 Grenade Machinegun.

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First Claim