I just recently started to build my dream carbine, everything is coming together great i just need to get a lower parts kit.
This is the delema does anyone know of a lower parts kit that would work really good with both 9mm and 223?
At the local gunshops here in the area they dont know exactly.
I have read on other forums saying that a two stage trigger wont work with a RRA 9mm upper.
They listed to use either a RRA single stage or Stag Arms single stage.
I wanted to be get the stoger of the two cause I read that the 9mm really beats hard on the lower parts pins
and parts. Also I really want to be able to bump fire if I want.
My friend has a RRA lower parts kit and his rifle and the trigger pull was very heavy. I couldnt bump fire it… 
Please help this is the last remaining thing I need to complete my carbine…
Thanks