a red dot wouldn't be a bad option for quick acquisition. it's just not best suited for magnification. yes they are available, but i sure didn't like having that much extra stuff lagged to the top of my rifle. with a 20 inch rifle, you usually aren't looking at a quick acquisition scenario. that's more for a "sniping" scenario.
Favorite range gun for the money - CZ 75B or STI Spartan V 9mm
Go-to carry setup - Walther PPS or PPQ in FIST kydex holster 1AK
Favorite semi-auto design - HK P7
"A Sig is like a lightsaber - not as clumsy or random as a Glock."