I run the Simmons Pro Diamond 1.5x5x20mm on my Clark Gator AR and find it fast in tight with decent magnification. I replaced my holosight as my primary optic. For deer, the low powered scopes can be alomst as fast as a red dot and the extra magnification can be very welcome out to 150 yards.
I used a Simmons Pro-Diamond on my 870 one time. Got me an 8 point buck. However, for me I perfer iron sights in the woods. Took it off and now I'll sell it. Saddle included. You interested?