So I went and turned in my last "old" certificate for a Gen 4 22. My thoughts were to just swap the trigger system & slide from a Gen 3 17 so my wife could shoot a smaller gripped glock and I get a G-22 upper to put my old G-17.......well that was before I realized the details the engineering crew at Glock made. Apparently in an effort to strengthen the frame specifically in the ejector housing area they modified the shape...guess what...the Gen 3 parts aren't interchangible. So, on to my question. Does anyone know where I can purchase a Gen 4 ejector housing for a G-17 so I can finish my swap? Thanks for the advice!