Also need and M2 sear and slide: The magic seven are: 1) M2 Hammer 2) M2 sear 3) M2 disconnector 4) M2 trip lever 5) M2 selector switch 6) M2 slide 7) M2 lever spring
M2 (Type VI) slides, round bolts, M2 mag catches, and M2 sears are frequently found on mixmaster M2s, especially the old Blue Sky imports. When I was a dealer, I got a Blue Sky (marked M1) that had everything except the trip lever, selector switch and spring! It had M2 Sear, disconnector, Hammer, slide, and potbelly stock. I swapped them out before reselling it.