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There were 2 companies that made them, but the spelling IIRC was a little different (Mowrey and Mowery ? ).
The earlier rifles were very good; but the later ones were not - the barrels were always good.
They were a copy of the Allen & Thurber late percussion box lock rifle.
There was a few different models made - a plains rifle (usually larger caliber), Squirrel rifles (usually smaller calibers), and shotguns - the plains rifles had steel frames; the Squirrel models a brass frame.
I forgot what frame was used for the shotguns, but they all had curly maple stocks.
Also IIRC, some plains rifles were made with a brass forend, held to the barrel with brass screws that tended to strip out.
The steel action is preferable, since the steel tumbler would wear the brass action, and require bushing to cure binding, over time.
The mainspring in these rifles was a flat spring, that curved over the tumbler, and was connected to the rear of the tumbler, with a link.
Some were weak, but they responded pretty well to re-tempering.
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