OK I profess to knowing little about Marlin Lever action models
need help to ID which 336 I have so parts can be ordered to stop cartridges from trying to feed back thru the loading gate
Assume there is a cartridge stop
Serial number starts 2214 so from that it looks like MFG date is 1979
All barrel has is model 336 30-30 It is a Micro groove barrel if that helps
ask away any questions and I will provide what I can till we get it fleshed out