The LMTA(R) .308 bolt was designed with the same materials and principles as the 5.56 Enhanced Bolt. This bolt is exceptionally durable, and it's no mystery why the system it belongs to has been selected by military units around the world. Specifications: Cailiber: 7.62x51 NATO (.308 Winchester), 6.5 Creedmoor Operating Method: Direct Impingement, Piston Bolt Only