GO2 Weapons PBR Piston (Precision Battle Rifle) is a lightweight evolution of the original G2 PSR with proven 3 position piston system for extreme duty. Weighing in at only 8lb 6oz. The PBR Piston can be used as a 7.62 battle rifle or can fill the role of a squad designated marksman rifle. With 16" SEPR match grade barrel, precision shots can be made with ease. Ambidextrous controls for shooter adapability. When th job calls for a large frame battle rifle for extreme duty, go with the G2 PBR Piston.