For the price, this is a nice little sight - ADCO 1x 3 MOA Red Dot Reflex Sight

I needed something small for my Remington Model 8. The dimensions looked right for this so I thought I'd give it a try. Mounting was easy, although I went through several rounds to get on paper. Once there though, it was easy to sight in for a 50 yard zero. Bottom line is that this little sight works great. I especially like the two color option with varying brightness for each.
My only complaint (if you could call it that) is that it has only 1x magnification. 2x would be better, but this sight works fine for short range shooting. Sure beats using iron sights at my age.