I have carried a weapon for a living. For searching a building in the dark, and with the reasonable suspicion that a bad guy is in there, a pistol light is the right tool.
If someone is questioning the efficacy of a pistol light, then they would look silly having one on a rifle.
If you do not work out a deal with bones, would you consider a HK USP 45 Tactical, threaded barrel with HK weapon light?
Also, I would like to take a look at it if you decide only to sell it. Lemme know