JP Rifles JP Low Mass Operating System Bolt Carrier Stainless for Large-Frame .308

JP Rifles JP Low Mass Operating System Bolt Carrier Features For the no-compromise competition rifle our Low Mass Operating System (LMOS(TM)) offers the most significant improvement in the felt impulse of the rifle compared to any modification other than the addition of a compensator. By reducing the reciprocating mass within the operating system the bolt velocity is increased while simultaneously reducing the overall impulse experienced by the shooter with each shot. Consequently LMOS(TM) e