Ruger’s little LC carbine is based on architecture from their highly successful 57 pistol, using both the magazines and fire control components from it to create a rifle that loads from the pistol grip. First seen on the Czech Sa23 submachine gun and subsequently borrowed by Uziel Gal, this shifts a large portion of the bolt’s mass forward, wrapping it around the rear of the barrel — yes, the LC carbine is a straight blowback. (top) How the LC Carbine started (bottom) and the LC Carbine after getting turned into an SBR