I wanted the ability to mount a TLR-1 to my non-rail 92 pistols, but had hesitations due to past experiences with many clamp-on products. The Tdi rail is a first class product, however. It is well made, and simple to mount - using the same size allen bit as used to remove the allen head grip screws on newer 92FS pistols. I have had the product mounted on several pistols, both "slanted" and "straight" dust covers. Throughout this process, I noted absolutely zero damage to the frame. The product can be used on both straight and slanted dust covers, but has a closer "weld" on the straight dust covers. I previously looked at two competitor's offerings, and consider this one to be the best choice.