Yep, long ago.
Follow the instructions and they send you a thin metal strip to use to check your 15-22 using the directions at the link you gave. Quick and easy. Or if you figure you are too clumsy to follow the directions you can send them the bolt and they will check it for you.
I'd be curious if anyone found a bad one.
Here you go, next to my LE6920:
20190420_224547.jpg
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