HellBoy .177 CO2 BB Tactical Air Rifle 18-rd BB magazine Semi-Automatic One 12 gram CO2 cartridge fits into magazine Velocity: 495 FPS Full-metal receiver, magazine, and barrel Weaver/Picatinny optics rail (removable carry handle) Full metal action, plastic only used on retractable stock, pistol grip, and handguard Non-adjustable trigger Field-Strippable Integrated Sling Swivel Mounts Rear sight adjustable for windage and elevation (2 flip-up aperture settings) 30"-33.5" overall length due to the adjustable stock Overall weight of 5.2lbs