The Primary Arms micro has held up fine through ~350 shots on the 22 caliber nitro-piston. Well enough that I felt confident handing it over to my father as a barn gun.
He, of course, got belligerent at me for thinking I had to give him my gun. And no amount of, “I picked this up on a lark and you have been whining that you need an air rifle for barn pests” would get him to mellow. The kids did find it amusing when the issue was settled with, “will you stop being so stubborn and a just accept a damn present!”
Now to get myself another PA micro for the Benelli, though. And hope that my kids grow up to be every bit as North-Country stubborn as my father.