more thoughts:
they both mount up solid, versatility going to the tlr-1s due to versatility and value/price. my version of the inforce/hsp wml has a yellowish tint compared to the streamlight's whiter tint. mounting on a long gun the inforce has the advantage of not needing tools as you can do everything by hand. the streamlight with the proper locking key needs a flathead or ive used pennies and quarters to tighten down enough to not fly off during recoil. i like that the hsp only takes 1 battery so i could carry spares so even with the shorter lifespan if you break it down to battery vs time you come out a little ahead with the hsp over the tlr-1.
so what do i recommend?
if you dont want to shell out the money for a dedicated surefire, and this is not a dedicated wml so you will use it on handguns and longarms get the streamlight. if this is strictly for your long gun and the streamlight isnt on sale id still recommend the tlr1 streamlight over the hsp but if you can find a good deal and are looking for another dedicated long gun light then the hsp isnt a bad choice. both are easy to learn to activate, that is on you. obviosly the hsp is less pro to accidents. there are way more models than the momentary on only version i have, so that may work better for you. good luck!
pics to come!