[Privateryan32]

hi guys got this gun used and i chrony it sunday and ive find something strange with .20 bb the rifle shoot between 336-340 and at the 5 shoot the chrony show me 427fps and i suppose that a problem with the rifle . all of the intern is stock plastic piston , plastic spring guide and stock spring and cylinder . help me please i dont know what to do ? here is a pic of the actual intern of the gun and the rifle