Since you are not getting any replies from BAR owners yet...
I shoot a CETME, which in not a BAR-quality rifle. But I shoot a lot of surplus. May favorites are:
1. Hirtenberger, which I have not been able to find lately. Shoots 2MOA in my rifle (with iron sights), relatively clean, and its the only boxer-primed, reloadable surplus.
2. Portugese, FNM headstamp. This stuff may be more accurate than the Hirt...I also get 2MOA with this stuff, but occasionally better. Its lower-priced than the Hirt, generally, and is widely available. Clean stuff, too.
I am Pro-Rights (on gun issues).