This DG switch (18a) fits my surefire x300 on a Kimber TLE with rails no problems. The switch is well placed and fit to the weapon and easy to activate from a natural grip position. It is not too sensitive so does not discharge the light when not wanted. Pressure pad part of switch can move left/right a bit because it is not secured.
Pros: easy to install, good pressure activation
Cons: pricey for what it is
This review was written in the old system and had content requirements that are different than reviews written today.