Luth-AR’s MBA-2 Fixed Rifle Stock is designed to mount to an AR-15 or AR-10 Rifle Length A2 Buffer Tube. The MBA-2 features multiple sling attachment points” and is a simpler version of the modular MBA-1 for shooters who do not require the adjustability. It is constructed of super strong glass filled nylon and incorporates a receiver end plate in the design. This Assembly Kit comes with everything needed to install the MBA-1 Stock to a 308/7.62 AR-10 lower receiver” including an A2 Buffer Tube” 308 Rifle Recoil Buffer and Recoil Buffer Spring.