The Rock River Arms LAR-15M ATH in .450 Bushmaster (MPN 450B1562.V1) is a semi-automatic AR-platform rifle built around a stainless steel 16-inch barrel with a 1:24 twist rate matched to the big-bore .450 cartridge. Rock River Arms fits an RRA free-float M-Lok handguard over a mid-length gas system with a low-profile gas block, and caps the muzzle, threaded at 5/8×32, with an RRA Operator muzzle brake to help tame recoil. An RRA two-stage trigger and Hogue rubber grip pair with an RRA Operator CAR adjustable stock and an oversized winter trigger guard. The rifle uses a safety selector switch and feeds from a detachable 5-round magazine. Among AR-platform rifles in the AR rifles category, the LAR-15M ATH favors hunters who want the hard-hitting .450 Bushmaster in an AR platform.

Key Specifications

• Chambered in .450 Bushmaster with a 1:24-inch twist rate.
• Features a 16-inch stainless steel barrel.
• Includes an RRA free-float M-Lok handguard.
• Threaded muzzle at 5/8×32, capped with an RRA Operator muzzle brake.
• Includes an RRA two-stage trigger.
• Fitted with a Hogue rubber grip.
• Wears an RRA Operator CAR adjustable stock.
• Uses a safety selector switch.
• Feeds from a detachable 5-round magazine.
• Weighs approximately 6.8 pounds.

Frequently Asked Questions

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

What twist rate does this barrel use? A 1:24-inch twist, matched to the .450 Bushmaster cartridge.

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

The hard-hitting .450 Bushmaster in an AR platform is exactly what the LAR-15M ATH delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.