I didn't know anything about this gun till after I bought it. There is evidently an ejector problem with these guns. Most 2nd generations now have a little brass looking rivet that holds the ejector in place but some do not, I have one of those earlier 2nd generation GSG 5's. ATI told me they would add the rivet for me under warranty even if I wasn't the original owner. The only cost was shipping it to them. I insured and requested a return receipt when they received it, so it cost me around $14. Check your ejector and see if it has the rivet. You tube videos say you can shoot the gun but eventually the ejector will come loose and you will need the rivet.