If you are in the market for a mini-holographic sight for a pistol, the Burris Fastfire III has a lot to offer. Easy to use, with plenty of adjustment to zero it either on a level slide mount or higher on a rail mount, it has several brightness levels that are accessed by a push button on the side of the optic – including an “auto” brightness setting. Tools are furnished for sight adjustment, and this process is painless. The slide mount kit has a piece that replaces the factory rear sight on the Glock slide, and so far has been very tight and sturdy for me. Should it appear to need it, I will use locktite on the screws later.
This is a very nice little sight that I think actually adds to the appearance of my G20, and those ugly plastic pistols certainly can use all the help they can get in this respect!