I have the nickel electro plated .50 percussion modelwhichis avery durable finish inside the barreland out. Itreally helps toclean up very easily. My son hunts with itusinga TC Break-O-Way sabot with a 240 grain lead hollowpoint over 90 grains of Pyrodex P, and it shoots to the same point of impact as patched round balls very, very accurately.