I rarely, and I mean rarely, pop off a 22lr sub through my AAC M4-2000. The AAC brake should take most of the beating and I only do it to pop an armadillo at night and grin at the quietness. I bet I shoot five hundred 5.56 rounds for every one 22lr sub through the can. No problems thus far.
Like you, I need to get a serviceable 22 can.
“Twenty years from now you will be more disappointed by the things you didn’t do than by the ones you did do. So throw off the bowlines, sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.”
- Mark Twain
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