You know it's what you really want - SureFire Remington 870 12 Gauge Shotgun 6V LED Forend WeaponLight

This is really the ultimate addition to your Remington 870. Yup, it's expensive. Just "bite the bullet" and buy the darn thing! (that's why we have credit cards, right?) Optics Planet had the best price, when I was looking. I'm quite happy with my purchase & very pleased with Optics Planet. They're on my "Favorites" list now.
Pros: Best 870 tac light system on the market
Cons: A bit on the expensive side of light systems available

This review was written in the old system and had content requirements that are different than reviews written today.