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I made this palm rest for target offhand shooting with the .36cal H&A underhammer rifle I had. (top)
I had removed the A&H's firearm, and attached the rest to the barrel underside.
I don't have any pics of the rifle, but in use, the palm rest is used like this:
I also ran across this pistol RR @ a funshow a few decades ago, and found it stout & handy for loading my T/C Patriot .45 target pistol.(lower)