Derringers were invented, or at least popularized, by a man named "Deringer" (note the single "r"). The original Deringer was a small, handy, single barrel, .41 caliber percussion pistol that could be easily concealed. A classic hide-out gun. John Wilkes Booth used one of these to assassinate Abraham Lincoln. When other manufacturers wanted to capitalize on the burgeoning popularity of these small pistols, they called their generic pistols "derringers," and that is where the extra "r" came from."
The Remington uses the short case, the long case went in a Colt revolver, IIRC. Most of those old Remingtons aren't safe to use any more, they loosen up pretty easily. Have it checked by a gunsmith before your buddy shoots it! This is NOT optional, those old relics can be dangerous nowadays.
They weren't very powerful, they couldn't even bury the bullet into a tree up to the base of the slug, but they can still make an old gun come unglued. Please have it checked out first, for your buddy's hands and eyes sake.
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