Okay, first off, it's for an AK. I bought this for an el cheapo red dot for short range plinking, NOT for benchrest competition at a thousand yards.
I was expecting to have to modify the length, as described in the product info, which turned out to be unnecessary for my rifle. The reason I'm rating this 3 stars is because the square hole for the cover release button required an excessive amount of filing. There's no reason that shouldn't be a perfect fit from the factory. You'll need a file small enough to clean up about a 3/8ths inch hole. I also had to do some bending at the front to get a slop free fit. Once I got those problems squared away, the fit is sold enough to keep it from wobbling too far off zero. Some of the features I liked is it's easy to remove unneeded rails and the top rail is see through so you can still use the stock iron sights with optics installed. If you're after an inexpensive solution for attaching a red dot, reflex sight or laser, this is good enough to do the job. I wouldn't recommend it for installing good glass, but then I wouldn't recommend installing good glass on an AK to start with. Other than an obnoxious amount of fooling around to get it installed, it's good enough to do what it's supposed to do.
Pros: About what you'd expect for the price
Cons: Too much fitting required
This review was written in the old system and had content requirements that are different than reviews written today.