specification CALIBER 4.5 (.177) /5.5 (.22) VELOCITY 4.5 OVER 1300FPS 5.5 OVER 900FPS SAFETY Automatic Safety RAIL Picatinny rail(11MM dovetail ) WEIGHT 3.8KGS TRIGGER 1-6LBF STOCK European Beech SUPPRESSER Detectable LENGTH 1310MM (muzzle) 1180MM (no muzzle) POWER SOURCE Gas Piston