RRA 9mm conversion help

[MCASSgt New River]

I'm highly considering a 9mm RRA upper complete with bcg for $300 shipped...upper and bcg is said to be NEW.

What other parts would I need and their approximate cost? Links would greatly help too!!

[LonghunterCO]

Heavy 9mm buffer (in your lower if you are using a carbine butt stock), 9mm hammer, mag well adapter (oh and mags).

-I think that Grant has this on his site for sale, or ADCO has it.