I have made a 3d printed collet that accepts 1 inch diameter flashlights. I put a chinese one on my gun that is 2k lumens instead of 700, comes with a pressure plate/button and has a water resistant charging port on the head that can be charged without removing the light from the gun. Ill sell the system to you for 50 bucks plus the cost of the light (about 100 dollars last i checked) I will shorten the button wire for you so that everything is tight. if interested dm me your email for pics of my rig.
on a side note I have almost completed a new project for the gun. this will sound illegal but i assure you its not. I have made a lower that accepts 32 round trommel magazines. im not sure what to charge for it yet but if you are interested let me know ill tell you all about it.