18-inch rifle-length gas system build with 15-inch M-LOK handguard. Optimized for long-range precision while retaining a lightweight profile. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2014, USA Weight: 128 oz Overall length: 37.5" Status: Active Intended use: Precision Shooting, Hunting, Competition