It's Gen2 MPX-C-9-KM-T. I only have two boxes through it, but no malfunctions so far. It's shooting way low so I have to adjust the front sight post - but I don't have the proper 4 prong tool yetDoc in Pa said:It doesn't matter. You will visit both web sites every day. Regarding your MPX--is it a gen 1 or gen 2 ????????? Doc in Pa.