jaqufrost, You are partially correct. XM193 is not a particularly accurate cartridge. It is adequate for my needs as I shoot only offhand and only to 200 yards/meters or less, mostly less, so there is not a need to pursue 1 MOA or better accuracy.
cda97, The BCM barrel looks nice, thanks for posting.
The barrel I am shooting now is 1:7 (attached to a BCM upper) so there is not a lot of motivation to spend money to go only to 1:8.
I do have a Mega Arms billet upper that is very lonely though.
I have looked at Hart, Krieger. Lilja, Pac Nor, and Integrity Arms, sent and email to McGowen and will contact Douglas tomorrow.
Some of the premium barrel makers had slower twists, one even had 1:12, but I am not prepared to spend $500 + the cost to have it Melonited for a barrel at this point.