Importance

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Abstract

An interchangeable upper receiver assembly for use with a hand held weapon and the interchangeable upper receiver assembly in combination with the hand held weapon, where the interchangeable upper receiver assembly includes an integral, unitary breech block and barrel that is operably removably couplable to the lower receiver assembly of the hand held weapon in an engaged disposition. A bolt assembly is slidably disposed within a bolt recess defined in the receiver breech block and barrel. The bolt includes a firing pin slidably disposed therein, the firing pin being selectively actuatable by the trigger assembly when the receiver is in the engaged disposition. A chamber for receiving a secondary ammunition cartridge therein is defined in the receiver and is disposed with respect to the firing pin such that actuation of the firing pin from a cocked position to a firing position acts upon the secondary ammunition cartridge to discharge the cartridge, the interchangeable upper receiver assembly being interchangeable with a primary upper receiver assembly of the hand held weapon.

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First Claim