Angry WCRS Outer Barrel Kit attach to the Systema M4 series bodies via the usual barrel nut. At its most basic, a replacement barrel can be used to vary the length of both the inner barrel and overall weapon size of your platform.

Besides the basics, barrels also come in a variety of styles and colors. Simple description rarely does the subtlety of aesthetics justice which is exactly what Redwolf makes use of a barrage of high resolution photos to let you see it for yourself.