[Set] Shotgun M8871 (CO2 Powered) - Black [Golden Eagle] + Mini Pistol / Carabine Red-Dot Sight - Black [JJ Airsoft]

Good, compact optic, with excellent controls, good glass quality and nice, clearly visible red dot, even has an auto turn off feature that kicks in in about an hour. Not sure how it will hold under rapid fire, as i am yet to take it to the field, but the construction seems sturdy enough.

Had this on a Shark full-auto pistol for a while and it worked fine until one day while shooting the glass just flew off. It wasn't damaged or anything just detached from the frame - managed to put it back with superglue and clean any mess on the glass with acetone, hasn't moved since (over 1000 rounds since then). To be fair, I had dropped it a few times before that, and the full auto blow-back on that pistol is quite violent, maybe on a NBB or at leas a semi-auto GBB it would be fine.
Apart from that it is decently build, and I haven't had any other major issues.
Overall quality is not amazing but not bad either - for the price it is decent.
The buttons are easy to access and it even remembers your brightness setting once you turn it off and back on.
The lowest brightness setting is still too bright, but sadly most red dots are like this.
The protective cap is made from clear plastic and if it is clean you can use the sight without removing it. It has an ear at the back for a string, but it is also a zeroing tool.
Comes with mounting plate for a pistol. Just remember to use the shorter set of screws when mounting it to the plate and the longer ones on the rail mount (comes with two sets). The screw that holds the plate to the pistol needs retightning once in a while. As long as it doesn't get too lose it keeps zero.