Im giving serious thought to a UBR on my 9mm SBR. I have a CTR now and can't stand the slight wobble even when locked.
How do you like yours with the short barrel.
It's a moderately heavy stock so it helps balance out the suppressor. I think I'll be switching a few of my other stocks over to the UBR. Both of my 5.56 SBRs now wear a UBR and I wouldn't go back.