If your model 41 is drilled and tapped for optics, there is a weaver base (number 62 I believe) that bolts right on and then you can add any optic that you desire. If your model is a rather old model, it probably is not drilled and tapped so you can either get a gunsmith to drill and tap it for a weaver mount (not recommended) or you can get a new barrel that is optic friendly.
I have a Clark barrel with an Ultradot. It shoots one ragged hole at 25 yards. My 41 is a 90s model so the factory 7" barrel is tapped for a rail and has a Burris Fast Fire III. I also bought a 5" heavy barrel from Ebay and use the iron sights. All shoot great a lock up tight to the frame.