Luth-AR’s MBA-3 Modular Carbine Stock is designed to be compatible with both Commercial and Mil-Spec Diameter Carbine Buffer Tubes for the AR-15 and AR-10 platforms. The MBA-3 is fully adjustable” and comes equipped with a 3-axis adjustable butt plate” adjustable cheek rest and adjustable length of pull. Additional features include multiple sling mounting points and a bottom Picatinny accessory rail for use in mounting a rear monopod. The MBA-3 will fit all .223 and most .308 AR carbine style rifles. It is constructed of strong glass filled nylon” is easy to replace and quick to install. An included anti-rattle screw ensures a secure fit to either diameter carbine buffer tube. This Complete Assembly Kit comes with everything needed to install the MBA-3 Stock to a 308/7.62 AR-10 lower receiver” including a Mil-Spec diameter carbine buffer tube” 308 carbine recoil buffer” carbine recoil buffer spring” receiver end plate and castle nut.