Decent optic for less than $70 - ADE Advanced Optics RD3-006A Mini Reflex Micro Green Dot Sight

Button on the front is a design flaw, especially for sunk-in slide mounts. Therefore I couldn't use it on the pistol I bought it for. I've put it on my .357 lever carbine and its a great fit. Optic is clear and crisp. The build quality is solid, and I like the rubber bumper sleeve they provide to reduce impact on the optic. Go ahead and give it a go if the price is right.