Excellent mount for the money...fit and finish is above it's cost. I needed to raise a scope on my SIG 522 about 1/2" to use a set of Leopould QD rings I have and this fit the bill for my needs without purchasing taller rings. The tightening knobs are rather large and had to be placed opposite the ring levers on the QD rings so as not to interfere but for my application not an issue...however this could be a problem with certain optics. The next taller riser should eliminate this problem. This riser would work well on S&W MP22s with polymer uppers to avoid maring the plastic rail when changing optics. This has been an issue with friends who own the S&W. The aluminum rail once mounted would be the point of wear not the the polymer rail of the upper. The long one piece rail makes for better options whe attaching different optics when compared to smaller two piece mounts. All in all...this worked very well for my needs.
Pros: Price, quality and ease of mounting
Cons: Mounting knobs are large and may get in the way of some optics
This review was written in the old system and had content requirements that are different than reviews written today.