any milspec parts not work in

[denniscalhounhare]

a commercial RRA carbine? Looking for a LPK and don't want to leave a part out that I need to buy directly from RRA.

Thanks

[mmike87]

You should be fine to mix and match parts in your RRA rifle. Any LPK that has the standard pin sizes (instead of the oversized "Colt" pins) will work.

[RD62]

Correct me if I am wrong here, but the oversized Colt pins, would NOT be considered Mil-Spec. So NO. Short of a FA or Burst FCG, there aren't any parts from a Mil-Spec LPK, that won't work in your RRA lower. Any CMT, LMT, G&R, RRA, Bushy, DPMS, CMMG, etc LPK will work fine.

And not to be short, but didn't you ask almost this same exact question already?

-RD62