I bought a Mark III Hunter about four years ago. I have a Simmons pistol scope 3-9 x, a Sightmark reflex sight, and a TRUGLO red dot sight and frankly 90% of the time I use the iron sights. The optics add weight. Of course it's fun to bench shoot the Mark III with the scope at 75 yards at the rifle range.
The best thing I bought for my Mark III is the "Ultimate Cliploader" made by McFadden machine co. You can find them on e-Bay. You just dump 50 or so rounds in the hopper slide the clip in and give it a shake and the clip is loaded. Saves lots of time.