I ordered 2 of these mini hand stops to use with key mod rails. One of the hand stops came with a non-threaded retention **** for the key mod setup, so it's useless right now. Also, there is only one hole drilled in the hand stop to mount it to your rails, but there should be 2. Mounting it with the just one **** works but it's easy to misalign it. If you have a drill and the right bits you can fix this yourself, and order an additional **** and retaining nut, but we shouldn't have to. The one I have mounted looks good and is very comfortable. If the company fixes the problems above it would be a 5-star product, but I wouldn't recommend this to anyone like it is now.