Any of you guys have problems with jamming? Cylender mag lets two shells in instead of one?

Any sugestions on fixing lever flop?

Yes, I had one that would do that. Seemed like the problem was due to working the lever slowly while tilting the receiver to the side. No problem when working the lever briskly with receiver in the normal verticle firing position. This might not be the best forum to post this question to. There may be a simple fix that I'm not aware of as I don't have that M39 anymore.

The following post from the rimfire board may be helpful. I wish I had checked that before I traded mine away.

https://forums.accuratereloading.com/eve/forums/a/tp.../871100051#871100051