This isn’t any normal caulking gun; this device was made from a staple ... [Clint] continued the build by adding several more barrels, each of which are rifled. The barrel rifling tool is ...

To do this job as a DIY project, though ... you then need to make sure you understand how to load and unload a caulk gun. After all, the caulk gun is meant to be reusable. You don't want to ...