The Rock River Arms LAR-15 Varmint A4 is a precision varmint-hunting AR-15 with a 20-inch stainless steel bull barrel, free-float aluminum handguard, and RRA's two-stage National Match trigger. The 1:8 twist barrel is optimized for 50-77 grain .223 Remington loads. Factory-configured for prairie dog and coyote shooting at extended ranges where the AR-15 platform excels. Type: Rifle Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 2004, USA Weight: 9.2 oz Overall length: 40" Status: Active Intended use: Hunting, Precision Shooting