The simple answer to what is the best flashlight for a Glock 19 would be a Streamlight TLR-7A. The Stream TLR-7A has a perfect fit with the Glock 19 as it sits flush along the end of the pistol and doesn’t stick out whatsoever. Streamlight makes high quality flashlights and one shouldn’t cheap out on a generic Chinese made knockoff like the many that are available on Amazon.
