In The Evil Within 2 the Laser-Sighted Handgun can be found from a corpse on a parking lot in the north-west corner of chapter 3. There’s a building with Neon Signs showing “Auto Repair Shop”. Go around the back of that building to find a gate you can break open. Then climb the blue box to hop over the fence to the parking lot. On the parking lot there’s a corpse by a car. Investigate it to get the Laser-Sighted Handgun.