specification CALIBER 4.5mm(.177)/5.5mm(.22)/6.35(.25) VELOCITY Cal 4.5 0.55g pellets,specialized from 3 to 8 joule Cal 5.5 1.0g pellets, specialized from 3 to 8 joule Cal 6.35 1.2g pellets, specialized for 7.5 joule WEIGHT 888g REAR SIGHT Adjustable for elevation and windage TRIGGER adjustable,0.5-4Lbf STOCK German Beech L*W*H 390*48*146(mm)