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bullets for the gun 

A backing reason or reasons for support.
Hey Bob, If you are going to ask your boss for a raise, you had better be able to explain why you deserve one. You'd better have bullets for the gun.

Take the bullets out of the gun 

When a man gets a vasectomy.

Bullets = Sperm.
A birth control pill for men, that's fair. It makes more sense to take the bullets out of the gun than to wear a bulletproof vest.