Umarex AER16 Electric BB Carbine Electric-powered Full-auto/single-action Uses .177 caliber BBs 55-round drop-free magazine Over 650 rounds per full charge Approximately 420 rounds per minute Max. velocity: 430 FPS Two-stage trigger Textured AR-style pistol grip Full-length Picatinny optics rail Removable and adjustable flip-up front and rear iron sights Adjustable buttstock M-LOK accessory slots on sides and bottom of handguard Smart LED MOSFET Overall Length: 32.36" Barrel Length: 15.95" Includes 11.1V 1100 mAh tri-panel Li-Po battery, charging cable, and 650-round speedloader