Rock River Arms LAR-BT3 X-1 .308 Win 18″ Rifle 20rd

The Rock River Arms LAR-BT3 X-1 is a billet-set AR-platform rifle chambered in .308 Winchester and built for accurate, optic-ready performance. It ships with an 18″ fluted, cryogenically treated stainless steel barrel and a free-float 17″ aluminum M-LOK handguard. The rifle uses a two-stage match trigger and an RRA Operator six-position carbine stock for ergonomic control. It is configured with a 20-round detachable magazine and operates as a semi-automatic.

Key Specifications

• The caliber is .308 / 7.62 NATO.
• The barrel length is 18 inches.
• The barrel is a 18″ fluted cryogenically treated stainless steel barrel.
• The action is Semi-automatic.
• The rate of twist is 1:10″.
• The magazine capacity is 20 rounds (detachable).
• The handguard is a free-float 17″ aluminum M-LOK rail.
• The stock is an RRA Operator 6-position carbine stock.
• The trigger is a two-stage match design.

Designed for shooters who prioritize straightforward, repeatable performance, the LAR-BT3 X-1 combines a billet receiver package, precision-oriented barrel and a shooter-focused control set. Its free-float M-LOK handguard and optic-ready upper make it adaptable for a range of practical shooting applications where consistency and ergonomics matter.