BrickArms Heavy Barrel
Detachable, and mountable onto any Lego creation, the BrickArms Heavy Barrel gives you the firepower you need.
(Disclaimer: All BrickArms tiny toy weapons are made of solid ABS plastic, designed to be used with LEGO® toys.
They cannot shoot bullets and cannot be made to fire bullets in any way. Again, they are a TOY! T-O-Y Toyee!)