I put this on my GSG-5 (2nd gen). It is rock solid and co-witnesses perfectly with the iron sights. In addition, It looks great. for $37 shipped, you cant go wrong. Even get a spare battery. The install was easy once I figured out the trick You need to completely remove the screws and claws. Start with the claws on the right side, just forward of the mating lugs, sight slightly canted to the left. Gently slide back while rotating to the left. It will go on with no force, if done correctly
Pros: Well built, affordable, compact, excellent co-witness
Cons: Little tricky to install
This review was written in the old system and had content requirements that are different than reviews written today.