US Patent 11536524 Composite modular rifle

A modular bolt action rifle is provided, having an upper receiver configured to receive a bolt action bolt housing and bolt and a first universal fitting at a front of the upper receiver configured to receive one of a plurality of commonly sourced rifle barrels, and a lower receiver integral to or coupled to the upper receiver. The lower receiver is configured to receive commonly sourced fire control group components and a commonly sourced bolt action trigger mechanism. The lower receiver includes a second universal fitting at a rear of the lower receiver configured to receive one of a plurality of commonly sourced butt stocks.