The Rock River Arms LAR-15M A4 in .450 Bushmaster (MPN 450B1542) pairs a mid-length gas system with a 16-inch chrome-moly barrel rifled at a 1:24-inch twist for the big-bore .450 Bushmaster cartridge. Rock River Arms finishes the barrel and receiver in black, adds a free-float M-LOK handguard, an RRA two-stage trigger, a low-profile gas block, and an RRA Operator muzzle brake to manage recoil. The rifle feeds from a detachable 7-round magazine and rides on RRA’s Operator CAR adjustable stock with an oversized winter trigger guard. Among AR-pattern rifles in the AR rifles category, the LAR-15M A4 favors hunters who want a big-bore, straight-walled-adjacent cartridge in a familiar AR platform.

Key Specifications

• Chambered in .450 Bushmaster with a 1:24-inch rate of twist.
• Features a 16-inch chrome-moly barrel with a mid-length gas system.
• Feeds from a detachable magazine with a 7-round capacity.
• Finished with an RRA Operator muzzle brake and a low-profile gas block.
• Includes an RRA free-float M-LOK handguard.
• Built with an RRA two-stage trigger.
• Rides on an RRA Operator CAR adjustable stock with an oversized winter trigger guard.
• The grip is an RRA overmolded A2-style design.
• Weighs approximately 6.8 pounds.
• Finished in black throughout.

Frequently Asked Questions

What gas system does this rifle use? A mid-length gas system paired with a low-profile gas block.

Does this rifle include a muzzle brake? Yes, an RRA Operator muzzle brake to help manage recoil in .450 Bushmaster.

What is the magazine capacity? A detachable 7-round magazine, sized for the .450 Bushmaster cartridge.

Buy the Rock River Arms LAR-15M A4 .450 Bushmaster

A big-bore AR-platform rifle built for hunters is exactly what the LAR-15M A4 delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.