I just finished assembling my AR in 6.8 SPC today, cleaned the barrel good, and had to shoot 5 rounds out of it to see if everything worked OK, and it did.
I bought an 18" Blackhole barrel, with black finish.
I don't have access to a nice range right bow, so I don't know how it did for accuracy, maybe too soon to tell. I did have the barrel cryo-tempered, and the price couldn't be beat, but I do send this place a Lot of other business at work.
I am looking forward to seeing what this thing is capable of soon.
Some other particulars on it
Stag Arms 6.8 marked lower, upper I don't remember, maybe YHM
DD carrier, LWRC bolt
geissele NM trigger
Battle arms ambidextrous safety, phase 5 extended skeleton bolt release
UBR buttstock
Tubb coil spring, spikes T2 buffer
BCM pistol grip
Ranier raptor ambidextrous charge handle
Troy 12" MFR quad rail hand guard
Gemtech-smith vortex flash hider with quickmounts
PRI adjustable gas block, YHM black rifle length tube
Larue LT111 scope mount
Leupold patrol 3-9 tactical (I wish it had a side focus,instead of on the eyepiece)
I am using PRI magazines for this rifle
Otherwise its just another black rifle, but I like it. Now I need to find some wild pigs.