Magnum slug weight vs...

R-73 is a lightweight tool steel pin, supposedly weighing 107 grams, according to the spec sheet.
I was thinking about asking IMM if they would sell me all the parts as a package, and how much that would cost, for the pistons, rings, and pins to make this work. Since I have to postpone my project, I never called them because I don't want to bother them before I am ready.
He did clarify in the previous posts that the piston weight alone is not what makes it work. It's the whole package of parts.