I’m having decent luck with an Aero M5 upper receiver and lower, A2 buttstock, 15” handguard, and a 20” Faxon Big Gunner barrel paired up with iron sights and a rifle length gas system. Does well enough, but I’ll admit my handguard feels a bit heavy and throws off the balance a tad.
The big do’s I’d say are:
-Do a rifle length gas system if possible, it really helps with the feel of these rifles
-use an adjustable gas block
-make sure your upper and lower receivers are from the same manufacturer. As noted above, they were not cross compatible like the AR15
-don’t buy an Aero/Ballistic Advantage barrel unless you plan to enlarge the gas port. The one drilled is too small for the 308 cartridge.
-sweet spot is probably going to be 18” if you can find that length barrel, as 16” will not be fully burnt by the time it hits your suppressor and with a can 20” will probably be too unwieldy.
