1:10 Twist uppers? Model1, J&T

[BRM]

I'd read where one Model1 customer recived a 1:10 barrel, My J&T is also a 1:10. I'm still waiting to see what J&T will do about this, I've had good luck with them in the past. Has anyone gotten good results with subsonic 220 grn bullets and the 1:10 twist barrel? If not, would model1 (or J&T) do anything to fix it? They said it was a 1:8 in writing, so I'm hoping that they make it right.
Thanks,
BRM