The plural form for the noun derringer is derringers.
We need a make of derringer.
Bill Derringer's birth name is William Derringer.
Denise Derringer is 5' 5".
Will depend on the make of derringer. They are not all the same. Would suggest you find a gunsmith to do this one. It is cheaper than taking one to them AFTER you work on it.
A derringer is a small gun.
antique derringer
Paul Derringer's birth name is Samuel Paul Derringer.
Robb Derringer's birth name is Robbie Warren Derringer.
S&W does not make one.
depending on what parts you kneed a good gunsmith can make the parts you need.
You can make a plural sentence by replacing the is with are and I with we.
IIRC, they made a model called that.