Rifle Stock and 9mm

[SporterII]

I have a basic rifle A-1 stock and buffer on a RRA lower and 556 upper. I intend to convert to 9mm and want to keep the rifle stock.
Do I need a spacer, heavier buffer or am I good as is?

 

[MosesTheTank]

You should be good. A buddy built a PCC with rifle length tube and it ran fine. We tried outrunning the bolt. I can get down to 0.1 splits and couldn't outrun it. And it had very little jump.

Report back on how it goes. I'm curious if full power or reduced springs make a difference. Probably not is my guess.

 

[TonyTheTiger]

A lot of guys are just cutting delrin rod to make spacers as needed. Most are shortening the stroke so that it just barely clears the bolt catch.