I'm looking at a TLR4 as well for a 7.62x39 pistol, don't need an LED flashlight as much as a good laser that runs on CR123 batteries. They're actually pretty cheap and last a long time compared to the button batteries or the 1/3n batteries.
I've had a Crimson Trace green laser on my 1911 for over two years and it works & holds zero, their universal red laser is just over $100 online if that's in your budget.
I've also purchased two cheap lasers over the years, a red universal TargetSport pistol laser (knockoff of the LaserMax) that couldn't hold zero thru one full magazine cause the adjustments didn't have any clickstops so the recoil would keep knocking it out of alignment, and a Barska green laser with a remote pressure switch that broke after a few months of use.