Excellent optic for the money - Black Spider Optics M0129 Micro Red Dot Sight, 3 MOA

+ I have purchased two of these optics, and one for my father.
+ The build quality is excellent.
+ Very rugged.
+ There are two mounts/bases available a low and a high. The short is great for general use. The tall mount is standard height that accommodates AR magnifiers (Holo-Sun, Vortex, etc...)
+++ I was a NinComPoop and ordered the short base by accident from another site. At the time the optics were still very new and Black Spider was marketing the bases by themselves. I contacted Cole Leleux and he sent me the appropriate mount for a few bucks. Excellent customer service.
+ Battery life is more than adequate with lithium AAA's.
- In low light the dot does have the potential to have a starburst or halo effect.
(meh) In normal light it is fine.
- This optic would be much better in 25mm - 30mm (Spikes ... are you listening? It's 2020 we likes'em thicccc)
+ I have not been kind to these optics either. They have taken a beating in the back of a side by side, a truck, hanging from a tractor seat, many trips to the range, and I have yet to lose zero.
+ I have good success using loctite OR heavy grease on the threads (with proper torque) and have never had one fall off. Generally I would recommend loctite for a permanent fixture, and heavy grease if you're going to be fiddling and tinkering. Adjustments are simple.
= Scope caps are small and black so they can be lost. Get yourself a magnet bowl or equivalent.
+ (flathead) slotted screwdriver, the adjustment clicks are very noticeable.