HK Dave & Dropping Deuces,
Thanks for all the input, I think I might give something like this a shot. Its expensive but id like to try out some high end stuff and see where it takes me.
The BGC included with their upper is the:
Seems like the upper and BCG are "match grade"... do you feel there was an improvement in performance using this or building off the SPR barrel would be a better idea?
Deuces and HK: I know this isn't the best idea considering what these barrel/uppers are capable of, but have you tried shooting XM193? Any improvement from a standard upper, or shooting anything but match ammo would be a bad idea?