Umarex TXP CO2 BB Pistol Uses .177 caliber metal BBs 16-round drop-free stick magazine 14mm CCW threaded muzzle w/cap (M14x1 counter-clockwise) Double-action trigger Max. velocity: 400 FPS Textured grip Fixed front blade sight Fixed rear notch sight Picatinny under-muzzle accessory rail Powered by one 12-gram CO2 cartridge Automatic trigger safety Barrel length: 4.8" Overall length: 7.8" Weight: 1.322 lbs.