Check the butt and receiver.
depending on what parts you kneed a good gunsmith can make the parts you need.
Go to this page: http://www.derringer.de/new82.htm
To contact FMJ makers of the 45/410 Derringer write to Leinad Inc.... PO Box 579 ....... Ducktown,TN 37326
This weapon was manufactured by the maker of the MAC10. I have an over-under derringer by FMJ Ducktown, TN. It is a 22cal under and a 410/colt 45 over. Some infomantion is under LEINAD which is Daniel spelled backward. Also COBRAY. JD
Best to take it to a gunsmith and ask for help
fmj make more dameage on your target when he/she is in cover XD
Bill Derringer's birth name is William Derringer.
Denise Derringer is 5' 5".
tmj thin metal jacket (bullet) fmj full metal jacket (bullet)
Go to a gun shop
Put hammer on half-cock and & push rear of barrel to the right.