Dang, I cant find it, but I bought a 12FV 223 and put a boyds AT One and it was pretty much a dropin. I had to trim a bit around the trigger guard but other than that I dont remember doing in any other until
I went ahead and glass bedded it. But, I did not have to do anything for the barrel channel I do know that.

I just went in on boyds and selected the AT one, 12 Top bolt release, short action, center feed blind mag and bull barrel.. I believe this is the one I purchased,
and i have a bit of room around the barrel on the sides.

BTW, I love the stock and the gun