Thanks Fellas ive owned a USP .40 Var 1 for almost 15 years. I had gotten bit by the 1911 bug and bought a couple Kimbers and quickly sold them and purchased the 45C after having to go through quit a few magazines and sending the new back in for work, never really got either of them running right (one was bought new) so i figured I would back to what I know works everytime HK.
William if you purchase a TLR-1 it will not fit the 45C without some midifacations. I was told the ne TRL-1 could not be modified to fit because of the new battary door. But I found away to make it work. You have to sane some of the material away form the tab that is inserted into the light to fit to the particular rail system you have on your gun. I was able to make it and be able to open the battary door to replace batteries when needed.
Correct Position
After Modification