At some point in your OT build you will be using rivets.  It may just be for attaching the thigh ammo pack for Basic, the cod tab for EI or all those plus the ab/kidney ones for Centurion.   It's honestly pretty easy to attach both kinds of these using basic tools you probably have on hand:  A flat-head screwdriver (preferably large), a drill with the correct size bits and a hammer.  Removing them will require a thin bladed flat head screwdriver, some heavy-duty pliers and perhaps a dr