I was considering a Streamlight TLR2 for my Legion and read where because of the Sig "rounded rail" design it could cause damage to the light and/or rail....Now I have not actually tried one yet , sooo I thought I would just ask to if anyone has experienced this??!!
Thanks

Based on my use of an old Streamlght M6-X and a TLR (1 or 2, can't recall) on non-Legion P226 I noticed slight finish wear along the accessory rails. Considering how tight the fit is for this interface and the friction involved I consider that to be normal. The fewer times a user attaches/ detaches the unit I would expect there to be less finish wear.

I never noticed any damage to the actual light unit.

The MK 25 and Combat have standard milspec pic rails and I don't know how that might affect WML fit or wear.

Welcome to the forum!

Tape the light with 2 pieces of black electrical tape. Trim off the excess. No damage.

I have a TLR-1s that I attach and remove daily when my EDC becomes a nightstand gun. It has affected the finish on the rail of my 229, but not to the point that I am worried about it.

That's all I need to know....Thanks guys!!

Streamlight advises on their website that the TLR series lockup will mar the finish on the light and pistol on the metal frame SIGs. That's life of a carry gun. As mentioned, try some electrical tape or even some grip tape.