How do I make a knex gun w/ a mag that won't jam?

When i try to make a gun with a mag it always ends up jamming because the barrel is slightly to big and I can't find an easy way to solve my problem.

DJ Radio7 years ago
The TBAP has a barrel that is narrow enough to take only 1 rod and no more.
MrSillyGuns (author)  DJ Radio7 years ago
i'll look into it
MrSillyGuns (author)  MrSillyGuns7 years ago
that really helped! thanks