I have a NIB Chiappa 1892 Carbine Lever Action in .357 mag. When I tried to cycle the action with dummy rounds, the action locks open. I have a hard time removing the round that is stuck (it will not chamber). What is causing this and can it be fixed easily? I am using .38 dummy rounds, but I do not think this would cause the problem.

Also, I would like any detailed step-by-step information in disassembling this rifle. Unfortunately, the manual does not address this at all.

And, I just discovered a crack in the butt stock near the right receiver.

Thanks for your help in advance.