Springfield Armory NHS, US NPS Allin was not a person to accept “good enough,” he kept experimenting with the Trapdoor concept. One version that he worked on was the center hammer lock. Here is shown the process of realizing his ideas: drawing, wood model, and complete test weapon. This was a model that did not go into production. Wooden Model of Breech Mechanism SPAR7818 
Springfield Armory NHS, US NPS Wooden Model of Breech Mechanism SPAR7826 
Springfield Armory NHS, US NPS Lock Model SPAR7829 |
Last updated: February 26, 2015