I have a few Winchesters with them , they are very good! Better then a tang sight, I think because they don't get in the way of your hand. they can be ajusted by tapping L-R. The model 38 is the same as the 21, but has a sm. wheel for ajustment. The down side if your looking for one is the cost! 94 win, about 200.00 and up, 86 win 400.00 and up. I haven't seen one for a marlin in awhile, if you can find one for a 1893 I would think 2-300.00 easy!