Howdy Henry. My thoughts are, firstly that this is not a SASS-legal sight. I'm guessing you don't care. So, with that out of the way, my first concern would be whether it would fit. It comes in two lengths, with the short one being 1.875". Have you measured from the dovetail to the frame on yours? I'm thinking a trapper in particular might have the rear sight close to the frame, but I am unfamiliar with the Mirokus. There are various sights available that will fit the space-restricted barrels. Other advice would be to drive the sight out from left to right and new one back in from the right (Ubertis are like that. Mirokus, too? Someone will verify). A tang sight, as mentioned by Blackpowder Burn, would give you a much longer sight radius (well, they always do that, but perhaps more important on a relatively short barrel). Good luck.