Rock River Arms LAR-15M A4 .450 Bushmaster 16" 7+1 Semi-Auto Rifle

The Rock River Arms LAR-15M A4 is a .450 Bushmaster semi-automatic rifle built on the AR-15 platform. This A4 configuration pairs a 16" blued barrel with a lightweight free-float handguard in an M-LOK compatible configuration, giving shooters a modern accessory-ready forend paired with classic blued-steel looks.

The LAR-15M A4 in .450 Bushmaster feeds from a detachable box magazine for a 7+1 round capacity. The barrel is threaded for muzzle devices, and the rifle is ready to mount optics, lights, or other accessories on the M-LOK handguard.

Controls and furniture include an RRA two-stage trigger matched to an oversized winter trigger guard for use with gloves, an RRA overmolded A2 pistol grip, and a six-position adjustable Operator CAR stock so length-of-pull can be tuned across shooters and gear.

Built in the USA by Rock River Arms, the LAR-15M A4 .450 Bushmaster brings straight-wall big-bore performance to the familiar AR-15 manual of arms. Each rifle ships with one magazine.

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