The design of the NEW stock was tailored for use specifically on AR15 rifles. The NEW stock design with two rear pockets for install of QD pockets unlike the older versions that had one pre-installed. Detailed Specs will be added soon. All of XLR’s Products are top of the line! Spec from XLR…. This buttstock includes a dual recoil plate system but the user can set up as a single plate if desired. Weight is 22 or 25.5 ounces respectively depending on how you have it set. Our AR stock has a shorter cheek rest for more LOP adjustments with the charging handle and it also allows more travel on the cheek rest. The buffer tube and castle nut are included but please note that a carbine length buffer and buffer spring is required.