When I need parts for my fx impact, I used fx usa. But today I search fx usa and it says permanently closed. I did some Google search to see what's up and it talks about fx usa being sue to fraud or whatever. I don't really know the details but seem fx usa own companies $6 millions? Anyway what if our fx guns needs part, where the heck do we go for parts in the USA? I read some guys say Utah airgun but have you guys really check Utah airgun for parts? Cause I check and they got shtz. Their parts selection for fx impact is crap. Anyway I just want to buy the new fx m4 brass piston to replace my plastic piston on my mk2. Don't say look on Utah airgun cause like I said, they got shtz for parts. I am concerned about the future when I do need other parts for my fx guns. As of now I just need the brass piston. Where do I buy this brass piston that's on the m4?