Same problem. CZ527 Magazine holds 5 7.62x39mm. You can load it in the CR527, but can't shoot. And also, when you eject ammo, you can't load it with 7.62x39mm.

I broke legs such way.

If you shoot in a another player or zombie, zombies start to respawn near you. And also they already agred on you.

"One server one life" - will solve this problem.