With the idea of a shotgun from a staple gun on a roll, [Clint] continued the build by adding several more barrels, each of which are rifled. The barrel rifling tool is a hack unto itself ...

In its native form, [Clint]’s K-441 is a caulking gun, able to apply silicones, resins, and liquid rubber from a reservoir with compressed air. It’s accurate, powerful, has a huge capacity ...

The UNISIG R-4-2-2 fully automated barrel cell is engineered ... capable of gun-drilling four barrels at once, while two gun-drilled barrels are precision reamed and two others receive the final step ...