Solid, basic, affordable - Vortex StrikeFire II 1x30mm 4 MOA Reflex Red Dot Sight

If you're uncertain about red dot scopes or just want to get started, you can't go wrong with this one. A very forgiving optic for eye position and eye relief, and a no-nonsense, no zoom, zero-clutter clear field-of-view. It is just a dot, red or green as you choose. No reticle. Zero as you would any other scope. Manual on/off which returns to your previous color and brightness level. With the included cantilever scope for rail mount, it was dead on right out of the box a 50 yards. Final adjustment, if needed, will be on the range at 100 yards.