9mm AR Compatability - CMMG/PSA

[Alsuyuufi]

I apologize in advance for reviving an old thread.
Roger, did you ever end up trying the PSA upper with your CMMG lower? Does it work? Did you try any other non-CMMG uppers with that lower?

Thanks.

[RogerRCKH]

CMMG/PSA worked like a champ. I would suggest it to anyone that wanted to build a budget AR9. I have since moved on to an MPX

[Alsuyuufi]

Thanks for the quick response man!
I assume it was the upper linked in your first post?

[RogerRCKH]

Yes.