Nambu troubleshooting...

[Zorba]

Originally Posted by nukem556

A "stovepipe" jam is usually referring to a FIRED case that isn't fully ejected and is caught between the bolt face and the chamber mouth facing up....hence a stove "pipe". What you're describing is a failure to feed and chamber. I'd suspect the feed lips on your magazine are sprung too wide allowing the round to sit too high to enter the chamber straight on.

Yea, its doing both - but your feed lip suggestion sounds like gold - the round does indeed look very high at the top! I'll try some "monkeying"!