The light/lasers you were looking at are not very good at all. They are from ebay stores and not listing the names of the lights displayed. But one or two of them are made by Nebo. These are all from ebay "stores" where they sell a lot of junk, especially when it comes to stuff like these lights/lasers. So no they are not any good. If you want a quality light/laser combo, you'll have to spend a little more money, sorry to say. This topic has been discussed many, many times on this forum.
If you want a good quality light/laser, this is what i'd go with. They go for about $240-to $260, depending where you buy it from. Amazon and MidwayUSA usually have the best deals for these. They also make one that uses a green laser instead of red. Like i said this has been discussed to death on this forum, but since you weren't getting any answers, i thought i'd share what's actually Good quality, and what is 'JUNK". You can also check out what Surefire and Inforce offer too. Why buy (waste your money on) something that will just disappoint you. I hope this helps. Vitaly has done reviews on this and other weaponlight systems; you can find them on the Rem870's main page. Yes this works great on a shotgun. Good luck!
Streamlight TLR-2 HL Weaponlight LED with Laser and 2 CR123A Batteries Fits Picatinny or Glock-Style Rails Aluminum Matte
The Streamlight TLR-2 HL Tactical Illuminator Flashlight with Laser is ideal for use on most firearms with a rail and installs in just a few seconds. This updated model features the new C4 LED technology with 630 lumens peak output. The light will run for 1.25 hours on 2 CR123A batteries (included). In addition to the light, this model also features a high power laser which will run for up to 45 hours. The body of the TLR-2 HL is constructed of rugged aluminum and is water, shock and dustproof. The laser is protected by chemical resistant polymer housing. The TLR-2 HL is covered by Streamlight's "No Excuses" lifetime warranty.
I plan on also buying the Mesa Tactical 6 shot side saddle, and 18.5 IN breacher choke factory Remington Barrel.
