The Crosman DPMS SBR (Short Barreled Rifle) is an accurate CO2 replica of an AR-15/M4 platform that fires 25 BBs in either semi or full automatic mode at 1400 rounds per minute and can be stripped down just like a typical AR. Crosman started with a DPMS PDW (Personal Defense Weapon) and added other tactical features like an angled foregrip, BUIS (Backup Iron Sights), and a mock suppressor while preserving the fully functioning controls and features of a real AR. If you are looking for an accurate replica of an AR-15 for training purposes or just plain full-auto fun then the Crosman DPMS SBR is the airgun for you! You should probably stock up on 12 Gram CO2 Cartridges!