I didn't want to drill holes in the dustcover of my 1911, so caspian and dawson rails did not enter into my mind.... but this surefire MR07 did. Retails at $150, my dealer sold it to me for $112 and tax!!
these pics are not my weapon, but I have one on my auto ordnance and it is build like a tank and fits extremely well!!!
it is made to utilize surefire x200 series lights and surefire military lights
I did notice that the insight tech m3/m6 fit too tight on the rail, and would need some "dremel" work to fit properly! but the x200 fits on there like a tight glove!!!