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LP2113 with LAR-PDS Aluminum Tri-Rail Handguard The first of a new generation of firearms employing RRA's patent-pending Piston Driven System (PDS). Featuring a new purpose-designed bolt carrier, adjustable gas piston and over- the - barrel spring and guide rod arrangement, the RRA LAR PDS is able to completely do away with the traditional recoil system, making for an extremely versatile weapon platform. Caliber 5.56mm RRA two stage trigger Hogue Rubber grip 30 round magazine included