Download: Single Shot Firearm Breech Block Design



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A new breech block design that should be a very strong alternative to what I used on the 9mm Luger carbine and also the 12 gauge break barrel shotgun and the 22lr derringer build. It's a floating firing pin design with "shoulders" to take the recoil load off of the mounting bolts. Made accurately of steel or maybe even cast iron, it should do the job well.

Here's a really fascinating WIKI page about "bolt thrust" or "breech pressure":
If accurate, the article quantifies the typical force applied to a breech face by different rounds. Gives you an idea of how much strength needs to be designed into a breech.

Here's a .pdf file of average shear strengths of different materials:

9mm Luger rifle build video:
Break barrel 12 gauge shotgun build:
22lr derringer pistol build: