Ok, Ok, I know you might not have an actual M4 Carbine but you do have an AR15 in some sort of configuration. There are plenty of ways to get a light on a gun and you can always get your own custom mounting system, but there are always do’s and don’ts when it comes to accessorizing. The most common thing people don’t do is mount optics, sights or flashlights properly. I’ve seen so many canted accessories and optics that I don’t understand why anyone would bother to shoot good ammunition when there elevation and windage are going to be off. When shopping for a firearm, you really should put some thought into getting a quad rail or an MOE system. I think the Magpul MOE system is a better idea because it lighter from the get go and kind of starts you at a less tactical point in the accessorizing stage.
With the Magpul MOE system you can just buy a rail, attach it to your forearm and then you you don’t need to worry about buying rail skins or rail covers. I’ve had rail covers on my 3 and 6 o’clock for years because I never need that now I’m looking into some of the Streamlight Flashlights like the TLR1S or the TLR2 since the newer 2013 models have 80% more lighting power. Last years model was 160 lumens and this years are 300 lumens. I always thought 200 lumens was a great lighting limit but it really depends on whether you are indoors or outdoors. In most situations indoors you don’t need as much throw as you do outside. Those are other things to consider when selecting a light on your AR15.