No issues, I have two RimX rifles. One in a Mcmillan M40A1, and this AT-X AICS. Both have Bartlien 5 groove 1/16 barrels spun up by TS Customs View attachment 8544234View attachment 8544235
I think a 1.25 is a no go in the atx if you want to run the bridge. I have a proof comp contour in one and it barely clears but does have room for flex. I did throw the rimx in the chassis and had zero issue but it needed the mag adjusted.