I picked up a stainless barrel nut from the classifieds a while ago to use on my long action build. Got my 25-06AI barrel and when I went to do a test fit tonight it appears that my barrel nut may be undersized. As I slid it down the barrel to install it stopped on the taper well short of the threads. Barrel is duracoated so I thought that might be the issue. Rather than trying to force it and self-clearance the coating, I decided to measure first.

Barrel shank measures as it should - 1.055" - across the top of the threads.

Inside dimension of the nut measures .040" smaller - 1.015".

I also measured the barrel shank right in front of the threads and got 1.035".

I know that I am measuring different dimensions between the nut and barrel threads. That's why I measured the barrel right in front of the threads as well to see if the nut would even fit over that dimension.

I don't have any other barrel nuts to compare too unfortunately and would rather not bugger up the nut or barrel in the name of stupidity.

Any chance someone can measure a nut or nuts for me and/or provide sage advice on what I experienced?

Thanks for the help.