45 ACP (Automatic Colt Pistol ... 45) Liberator, aka the OSS Liberator. The Liberator pistol was designed in May 1942 by George J. Hyde Sr., a German-born American machinist and gunsmith, and ...

Unlike previous 3D printed guns like the Liberator, this 3D printed version ... feat of rapid manufacturing – firing .45 ACP rounds, this gun will see 20,000 psi every time the gun is fired.