I got this to go with a red dot I bought so I could see over my triangle sight on my M4. I got this and picked it up. It stunned my how solid and heavy it was. This thing is 100% solid metal. It will never break. Instillation is a pain trying to get it past the delta ring and with the allen key locking system it has. However, once you get it one is doesn't go any where. The rails are the standard dimensions so anything else built to standard 20mm dimensions will work on this riser. Recommended for anybody in search of a tall riser.
-Long (length of the rails under the carry handle of an M4/M16
-SOLID METAL, not ever going to break, ever
-Once you put it on, its not going anywhere.
-Built to 20mm standard rail size
-Instillation is a pain
-taller than expect (1/2" or so)
-looks odd on M4
No major cons and these took some thinking.