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Tape
A knex gun: Find one that's ram rod hits the bullet fully, instead of just touching the edge of the bullet
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Althought I think you can make this alot easier if you just put oodles of masking tape around the end of the ram that sticks out from the gun (Erm..... The connector piece). That's what I did on the current gun I was working on, and it hardly makes a lot less noise then usual.