Bought this off a lad who was running it on HPA and didnt know what they were doing, the mock gas piston, which houses the nozzle return spring has snapped. I have all the parts here ready. Needs a bit of JB weld or something along those lines to reconnect the two halves of the gas piston, I just dont have the time to get on with it. This is a quick and easy way of getting yourself a cheap full auto Tokyo Marui Saiga SBS.