To start, $19 is a REALLY good price for what you get in this pakage.
First, the external build quality is great; nothing wrong with it at all. Note: The actual body is seprate from the mounts. The reason being is that the mounts are reversible if you will; they flip over to fit either a 3/8 inch dovetail mount or a standard 20mm picitany rail. You do need to put some muscle into the tighning nobs so they are solid against the sight and rail, but once its secure, its not going anywhere.
The housing for the adjustment and lense are solid, but the real kicker for this sight is that it seems to be paralax free. If its not, its pretty close to being that way.
The brightness is great; bright on a sunny day and the green is great for indoors and low light environments.
My only beef about it is that the dot is fairly large, so not the greatest for long range but then again I'm used to shooting with a 2 MOA dot, so not that bad.
-Solid build quality
-Somewhat big dot
Overall, great buy for $19, especially for those with a budget.
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Rating: [5 of 5 Stars!]