I’ve had two of these on different 12g shotguns for a coupe years, didn’t break the bank and they have surprisingly held up to recoil. The lights are a two pack of mastercraft “tactical” flashlights, they are 1” dia bodies and fit in any 1” ring or light/laser mount. I originally tried them to see if they would break from recoil but they won’t lol.
The side mounted one on the forend acts as a hand stop, has bright, low and strobe modes and takes 3 AAA batteries. They were cheap and still available at Crappy Tire, my only complaint is they’re in the 200-300 lumen range but for indoors they’re fine. If I was outside and shooting at critters more illumination would be nice.