This April 2018 I dug into a box of parts to find this month’s giveaway. And what I found is a (slightly used) SureFire DG-11 Switch. I previously did a video review of the DG Switch. They are a great piece of gear, allowing you to manipulate your light and break shots one handed. This particular one fits a whole bunch of Glock models, mainly full size frames.
If you want to pick up a SureFire DG Switch, you can find them here.