Bought a used CZ 712 ALS at Sportsmans Warehouse the other weekend. Looked barely used. Got it home and fired it, would not cycle the action at all. Took it apart and noticed the gas piston was missing. Went back to Sportsmans and they said tough luck, i signed a paper. So I contacted CZ and the rep just emailed me a generic part order form and said to fill it out and email someone else and I may get the part. Anyone else have experience with getting a part ordered like this from CZ? Is that part interchangable with other models I could maybe look for?