The LAR-15 X-Series X-1 Rifle features an Operator CAR 6 position buttstock a flat top optic-ready upper and a Hogue rubber pistol grip. It features a RRA TRO-XL Extended Free Float Handguard with a low profile gas block. It has Rock River's excellent two stage trigger and an oversized winter trigger guard that's perfect for gloved hands. This LAR-15 X-1 Rifle is chambered in the ever popular 5.56 NATO cartridge and accepts .223 Remington. It's built for long range precision with an 18 stainless steel fluted barrel that has a 1:8 twist and a RAA Beast Muzzle Break. The LAR-15 X-Series X-1 Rifle from Rock River Arms is an attractive and exceedingly effective AR15 style rifle that offers fantastic performance in any shooting environment! - Rock River Arms LAR-15 X-Series X-1 Rifle AR1751B - AR-15 Semi Auto Rifle - 5.56 NATO accepts .223 Remington - Forged A4 Aluminum Flat Top Upper Receiver - Forged RRA LAR-15 Aluminum Lower Receiver - 18 Stainless Steel Fluted Barrel - 1:8 Twist - Threaded 1/2x28 TPI with RAA Beast Muzzle Break - RRA Operator CAR 6-Position Buttstock - RRA Two Stage Trigger with Winter Trigger Guard - RRA TRO-XL Extended Free Float Handguard - Hogue Rubber Pistol Grip - Black Furniture and Finish - 30 Round Magazine - Weight 7.7 Pounds - Overall Length 36