The Alpha Stock MK2 by Trinity Force is versatile enough to work with any AR build. Featuring a Patented locking system. The Alpha MK2 is easy to install and remove on any Mil-Spec buffer tube. The butt-pad profiles angled to accommodate plate carriers and the aggressive texturing will ensure minimal movement when manipulating the rifle under stress. For your safety, Trinity Force recommends this part be installed by a competent, qualified gunsmith/installer with an understanding of the weapon platform that the part is being installed on. Always make sure the firearm is unloaded and pointed in a safe direction when working. Proudly made in the USA.