I have a Vortex Strike Fire on mine. It stays on target, has a lifetime warranty, and their designs are high recoil tested. I can stay in a 3 inch square at 100 yards with it. The only issue is some people see the dot out of shape at first. Seems to clear with use. Mine started oblong, but acceptable and is now a crisp round dot on both red and green after several hours use. They are usually available about $170.
Check out orlandotactical.com for anything we've managed to get a deal on.
My Surplus gun collecting site:
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