Based on the ultimate war fighter rifle the M4, the DPMS SBR (Short Barrel Rifle) gives shooters everything they want from a full-auto M4 adapted for maximum airgun fun. Officially licensed and stamped, the DPMS SBR slings blistering semi and full-auto repeating BB shots, fueled by two 12-gram CO2 cartridges housed in the 25rd magazine. Adjust your SBR to your preference with a 6-point adjustable rear stock and get a steady support from the moveable hand rest on the forend. The SBR's quad-Weaver/Picatinny rails give you limitless opportunities for mounting flashlights, pistol grips, and lasers. Each package includes removable pop-up sights and the rear sight is adjustable. The fire-mode selector lets you choose between semi or fully-automatic shots at 430 fps.