If you are in the market for AR15 accessories (which you undoubtedly are) you should definitely check out Arisaka Defense. Their MLOK finger stop and inline flashlight mounts are pretty damn good to go. This one has a Modlite OKW 18650 setup and it works really well. The rail is from bootleg inc, their MLOK rail is light and works well. Barrel is a Rainier Arms Ultramatch 2 shorty.