Mk7 Battle Light is rated 4.2 out of 5 by 6 .

Rated 4 out of 5 by Sgt T from Moss 500 Received today and installed immediately. Upon installation I did run into a problem just like a previous reviewer the outer diameter of the adapter is oversized and does not allow to be fully seated the adapter interferes with the and barrel lug, The removal of some metal from the log was possible with a Dremmel to allow the adapter to fully seat I also installed a rubber crush washer between adapter and lug for solid install.

Rated 3 out of 5 by John12 from Perfect idea falls a little short So I have been looking for a light that mounts like this for months. (Ever since I got my shotgun). It seemed like such a no brainer to me, from the get-go, to mount a light on the end of the magazine tube, but NOBODY else does it. So I was so thrilled to find this.But it seems like a GLARING oversight to not include a remote pressure switch with this light. As it is, it is almost impossible to reach the switch on the end of my five round tube. A remote pressure switch, to relocate the on/off function directly onto the fore-end would have made this an absolutely perfect light. Incidentally, I can confirm that the Remington 870 version fits nicely onto the IAC Hawk shotguns.

Rated 5 out of 5 by Dwbagley from Great product Just got my Steiner Mk7 tactical weapons light for my Mossberg 500 JIC 18 1/2" barrel. What a great product... The light is even with the end of the barrel. No parts or brackets hanging off the sides to get hung up during use. And it all fits in the quick-draw scabbard... Good Stuff...

Rated 3 out of 5 by Col D from Beware with older model shotgun This is a nicely engineered product and produces an intense white light. The disappointing thing is that the adapter which replaces the takedown screw of my early'90's Mossberg 500 is too big in diameter to allow it to screw down all the way tight. So unless Steiner can provide a smaller diameter adapter this light is unusable for my gun.

Rated 5 out of 5 by OPNLguy from Installation challenges on a Mossberg 500 When I mounted it on my 18.5" Mossberg, the light extended about 1/2" past the end of the barrel. I don't see an issue using the shotgun, just FYI. I also tried to install this on another Mossberg 500 with a 18.5" breacher barrel, and the light would NOT fit due to the flare of the breacher.