Rock River Arms LAR15X Varmint A4 Features The Rock River Arms LAR15X Varmint A4 is built around a 20-inch air-gauged stainless bull barrel cryogenically treated for stress relief and stepped from .920 inch in diameter at the gas block to 1.050 inch under the handguard for exceptional rigidity and heat management. The 1:8 twist rate stabilizes a wide range of .223 Wylde-compatible bullet weights giving shooters flexibility in load selection for varmint work at extended ranges. An RRA two-stage varmint trigger delivers a crisp consistent break that supports the rifle s documented 3/4 MOA accuracy at 100 yards while the oversized RRA Winter Trigger Guard accommodates gloved hands in cold-weather hunting conditions. A low-profile gas block keeps the barrel profile clean under the free-float handguard for consistent harmonics shot after shot. The forged LAR-15 lower receiver and flat-top A4 upper receiver provide a rigid mil-spec-compatible foundation while the ambidextrous mag release speeds up reloads regardless of which hand runs the controls. A 17-inch RRA lightweight free-float M-LOK handguard isolates the barrel from grip pressure and accessory loads preserving the accuracy the bull barrel is built to deliver. An A2 fixed buttstock and Hogue rubber pistol grip round out a stable familiar shooting position for extended range sessions. At 9.2 lbs and 38.25 inches overall with an RRA case and one magazine included this rifle delivers a complete accuracy-focused varmint package for shooters who demand documented performance. Rock River Arms LAR15X Varmint A4 Specifications Brand: Rock River Arms Model: LAR15X Varmint A4 Caliber: 223 Rem/5.56 NATO Action: Semi-Automatic Barrel Length: 20 Barrel Material: Air Gauged Stainless Steel Cryogenically Treated Barrel Diameter: .920 at Gas Block / 1.050 under Handguard Twist Rate: 1:8 Capacity: 20+1 Handguard: 17 Free Float M-LOK Trigger: RRA Two Stage Varmint Stock: A2 Fixed Accuracy: 3/4 MOA at 100 Yards Overall Length: 38.25 Weight: 9.4 lbs Available At: GrabAGun