Grennell referred to in his 1989 book The Gun Digest Book of the .45, as “The Weirdest .45”: the FP-45 (as in Flare Projector Caliber .45) Liberator, aka the OSS Liberator. The Liberator ...

It can hold a standard semi-automatic rifle as well as a shotgun or grenade launcher attachment. 1. The Liberator is a 3D-printed pistol made of plastic. The plans to build the gun were released ...