Century Arms C308 semi-automatic rifle is built around a roller lock delayed blowback system. The 18" barrel is made of 4140 chrome moly steel, with 5/8x24 RH muzzle threads and a proprietary chevron brake. The C308 has a fluted chamber for reliable cycling and extraction and a Mil-Spec 1913 Picatinny rail mounted to the receiver for mounting optics. The C308 accepts G3 and CETME magazines. This model is has wood furniture and a black metal finish. It includes two (2) 20-round magazines.