My boss and i put one together for him last summer, what a blast!!! first off, it is made to buy the hi cap mags, and clamp two together. next, there is a muzzle clamp and rail, that will go around that shroud, and you should hang a light off of that, from the bottom. then, the top rail can also take a mount, and it screams for a green light laser. We took this out on his ranch at evening time, and cowitnessed the light, and the laser, at about 50 yards. My boss, being not rifle shooter at all. proceeded to rapid fire eat out the center of a paper target at the 50 yards, with the green laser directing the way. then at night, the laser can be seen, visibly from the sides, to infinity, or right through tree limbs, so cool. I would definitely do the add ons.