The reason a trigger rivet jig exists is obvious only if you've tried doing it before 
The center support and the rails block you from directly riveting the rivets, so you have to jury-rig something to work around this. Makes for some interesting rivet attempts. The jig simplifies the process to allow you to do all five rivets in one operation, all in alignment.
The center support and the rails block you from directly riveting the rivets, so you have to jury-rig something to work around this. Makes for some interesting rivet attempts. The jig simplifies the process to allow you to do all five rivets in one operation, all in alignment.