I have a Mach 1 conversion S-12. For a few reasons I ended up buying it converted rather than doing it myself. While I can't say there is anything wrong with the conversion itself, and the gun shoots fine, it is for sure something I could have done myself, and would have if doing it again. I will say its not comforting to buy a converted weapon from a shop <name withheld> and find that they "rounded off" the screw holding the rail in place on my brand new gun. Also said same shop seems to not know how to ship properly to a FFL dealer. ( My S-12 went back and forth a couple times due to m