the more classic government one has the incorrect mag. It has one marked 10mm auto. It shoots beautifully but quite it often dosent lock back on the last shot. The wilson combat is non functioning but the only part it needs is the o ring for the back of the nozzle. I got it running with a 10mm inner diameter 1.5mm cross section o Ring but the gas efficiency was bad so it probably needs slightly bigger than that. I went up to 11mm and I was getting 1 shot before the oring broke so somewhere in there is what you need. There is also some damage to the inside of the slide. One of the rails the blowback unit slips into is cracked. The wilson combat comes with its original mag and one brand new boxed one. All mags are gas tight. Looking for £100 each all in.