I had an idea to cut the head from a rifle cartridge and solder it to the top screw that holds the swivel to my slings. I used a 30-06 cartridge for my Remington 700 in 30-06, and a 30-30 cartridge for the sling on my Marlin 336. I polished them with a dremel so they are glossy. It really adds a nice touch to the rifle.