Get your copy of the Derringer 357 Cop exploded diagram here.
Derringer 357 Cop was a four shot firearm, which was held with one hand made for .357 magnum round.
Derringer 357 Cop has a relative strong and tough structure. All the 4 chambers of this firearms has individual firing pins and uses internal hammer.
Here you will get to see parts of Derringer 357 Cop separated, yet in positions that show their correct relation to one another.