.22 cylinder ID help?
I came across some cylinders in my travels today, and these 4 are eluding my smarts.
The 3 on the right are identical, except one has an "M" stamped on the face. They aren't Ruger, just a tiny bit longer and the star is a bit smaller. The one on the left is unfluted, marked .22 WMRF, and has a tiny star.