Action: Semi Auto - Caliber: 5.56 / 233REM - Finish: Type III Hard Coat Anodized - Sights: Adjustable Post/Rapid Deploy - Barrel Length: 16.1 - Overall Length: 34.4 - Weight: 7.1 lb - The milled gas block is located at a carbine length (M4) position for improved balance and handling. Multiple attachment points include a QD socket for many sling mounting options. Serrations on the angled face of the gas block provide a low glare surface. - The handguards are made from heat-resistant glass-filled nylon for shooting comfort and durability. - The front sight post is elevation adjustable and a front sight tool is included. The A-2 Style F-Height allows co-witness with many optics. The Ruger