Fallout New Vegas Laser Detonator Glitch (Loud)

Equip a gun, (missile launcher fat man, ect, just needs to be an explosive type ammo) Hover over the add item to the quick select, move over to the ammo, click an explosive, equip the laser detonator, and click on the key you put the ammo on.

Sorry I forgot the specific buttons, but, this also works on other things. You have a 44 magnum but just a handful of magnum ammo. Put 9mm on it and go crazy. It also works on grenades, mines (You would use a 9mm ammo and you can pick the mine up for 'infinite' mines), throwing weapons, and melee.
They all consume ammo except for melee.