Have you tried it, for plinking purposes, was the accuracy better than a standard run of the mill stainless upper?
I ask because I have a 24" 1:8 Stainless bull barrel upper which is my current target setup, and contrary to what everyone says about XM193, its groups very well at 100 yards. About 1-1.25 MOA consistently (10 shop groups). Sometimes better if I do my part and wind isn't wild that day.
I don't know if that's attributed to the load or my barrel, but I have come accustomed to XM193 shooting well. For days I'm hitting steel at 400-500 yards, I don't see the need to use match ammo using that rifle. Its just heavy, and I wanted an SPR to have something a bit more mobile. I hope I can see the same results, if I can, I would consider selling my existing 24" BB setup.