I just got my book "The Underhammer Rifle" by Jeff Baron. Thanks longcruise. The book tells pretty much all I need to know about several designs of underhammers. Some I am not familiar with. They are Carleton, Chase, Composite (an adaptation of the Cooper and Briggs lock), Cook, Cooper, Hilliard, and Wood. I like the designs that use the mainspring as a trigger guard. That includes the Carleton, Cook, and Wood. Right now I'm thinking I like the Wood best. I'd like to build my first one in .36 caliber. We'll see I suppose.
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