Thanks! I’ll remember that as I can’t get .22 shells anywhere!
I keep the little inserts in all my .22s until I want to have a trigger session with live fire. The wall anchors will not feed smoothly through a semi magazine, but they will seat in the firing chamber to allow dry fire practice. The extractor will pull them free of the chamber when you want them out, usually, if you haven’t flattened the plastic rim too much.