Great short-range parallax free dot sight if you can tolerate strobe light - Sightmark Mini Shot Pro Spec w/Riser Mount

This is my favorite entry-level dot sight for air guns.

Unlike many "parallax free" dot sights, this one truly does have almost no off-axis parallax error at short range out to 100 yards. The optical quality is also decent.

My main gripes are that the 5MOA dot reticle is larger than I prefer, and the dot reticle visibly strobes to prolong battery life. Long battery life is good, but for my purposes I would prefer to simply replace the battery more often and not have to see a strobing reticle. Or else increase the strobe frequency so that it is less-noticeable.

I'm not sure why the removable armor shield is designed with "ears" instead of wrapping around the top. It seems like they could snag, but I haven't yet actually had issues with that for recreational target shooting.

I certainly would not rely on it for concealed carry or personal protection.

If high recoil is a concern, I would look at something higher-end like Nikon or Holosun.