John Martz was a WWII US Navy veteran who spent a career in metalworking before turning his gunsmithing hobby into a full time occupation in the 1960s. He is best known for his custom Luger pistols, but also worked extensively with the P38. Today we are looking at an assortment of his custom P38s - a baby model with a shortened barrel and grip, a standard pattern gun converted to .38 Super, and a long barreled model converted to .45 ACP.