 The bolt contained no firing pin or striker, just a ceramic cap that would electronically detonate the primer via the battery charge.The cartridge was designed by Hubert Usel and is known as the Usel Caseless Cartridge (UCC).The round was encased in a block of solid nitrocellulose and because it was not an automatic rifle it did not have the problems with cooking-off that plagued earlier military attempts such as the Heckler & Koch G11, in which the built up heat of sustained fire caused rounds to detonate immediately upon entering the chamber, releasing more heat, and often resulting in an uncontrollable burst of automatic fire until the magazine was emptied (although this is a risk in normal metallic cartridge firearms as well).