Best light i've used by far - Coast LED Lenser Convertible Tactical Weapon Mount Light LED Flashlight LL7736TS - 83 Lumens, 3 x AAA

I love this light, I've used it on a Hi Point 995 carbine, 4595 carbine, Mossberg 500, and will soon be mounting one to my M4 also. It's nice and bright, and with the added pressure switch it makes an excellent addition to any weapon. The light is good and sturdy and I'm still using the same batteries I put in it when I bought my first one over a year ago.
Pros: Bright, AAA batteries, pressure switch compatible, sturdy
Cons: no focus

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