The major brands are all good 'mini dot' sights

by Miles , CIVITATES AMERICAE, Thursday, May 19, 2016, 15:19 (3117 days ago) @ MS

However I was able to get my hands on the Insight (L3) MRDS mini red dot sight before I considered about buying one.

They are quite tough for a battery powered model and you don't have to dismount the sight to change the battery,

Later, I also got a Trijicon 'dual power' (tritium/fiber optic) mini, mainly because it doesn't require anything to 'turn it on'. It appears to be pretty stout too.

One thing, don't be penny wise and pound foolish if this is for a 'go to' gun.
Cry once.