I ordered one of these in for a customer.  Have to give SF a big thumbs down for this design.  The light and laser is OK, but all the issues stem from the mounting and rail fit.

The rail is designed sloppy with some centering wedges.  The female rails are so loose,  they will not and cannot tighten onto the gun rail.  If you can get a bite, it would tend to cock the device off to one side and mount crooked.

In addition, the clamp bolt and wedge bolt would not align with the rail slots on three firearms.  Two S&W's and a Glock.  The geometry just not right.  The end of the lamp housing would stop at the trigger guard and prevent the locking bolts from entering the proper rail slot.

Bottom line, I'm stuck with it and have to deal with a return and all the stellar SF customer service (sarchasm).  Avoid this one guys.