It’s decent - SightMark SM25016 LoPro Mini Laser Sight Green Laser Picatinny

For the price it’s hard to beat. It’s bright and lights up well. Sadly, the spring that holds the battery in place for recoil reduction fell off the screw on cap, and while trying to put it back on flew in some random direction. While it still works without, it can no longer handle firing. Don’t know spring size as it’s not listed anywhere that I can find thus far.