Works great - Yankee Hill Machine 5.56mm Crush Washer For 1/2 Inch Threads YHM-28-5C-W

I installed this crush washer on a custom upper build with a bunch of various parts. everything went together with no issue and it works fine. It's very important to remember that if you're doing a new build you should not reuse the crush washer. It's such a cheap part and necessary to be replaced