Ok, I got the info needed. Looks like these barrels would work for my project. My new dilemma is where to find one. Any ideas on that? Only found a couple places that sell them (or did so in the past), and of course they're outa stock, just like every other bleeped barrel in existence right now. Anyone know a source for scrapped barrel stubs from demilled rifles? If I had a stub, I could actually test fit my project and know with certainty. Surely these things are floatin around out there. I know I have a pretty good selection of them from all my kit builds. Anyway everyone have a great weekend!!