I have two CMMG setups, actually one is an old Ciener unit that the CMMG is an exact copy of (in fact I've switched parts back and forth between the two units). In semi auto both run great. On the M16 lower, there are a few types of ammo that the CMMG doesn't like to run in full auto, but with the vast majority of ammo it runs like a top.

Get the stainless steel bolt for better reliability.

I didn't order mine with the forward assist or the bolt hold open adapter (BHOA) so I can't speak to those.

O2