The LWRC SIX8 is a 6.8 SPC piston-operated AR-15 built around LWRC's proprietary polymer magazine specifically designed for reliable 6.8 SPC feeding. The piston system was considered particularly advantageous for the 6.8 SPC's higher operating pressure. Type: Semi-Auto Rifle Action: Piston-Operated Caliber: 6.8 SPC Capacity: 26 Year introduced: 2012, USA Weight: 7.3 oz Overall length: 35" Status: Active Intended use: Patrol, Tactical, Range