Luth-AR MBA-4 Carbine Stock with Cheek Riser, Fits AR-15 & AR-10 Commercial and Mil-Spec Dia Buffer Tubes, Black MBA-4-CHP Luth-AR's MBA-4 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. Similar in look and feel to the modular MBA-3" this is a simpler design for shooters who do not need full adjustability. Length of pull is still adjustable via an anti-rattle screw that engages one of the positions on the carbine buffer tube. The stock also maintains the multiple sling attachment points and rear monopod Picatinny rail. This particular model also comes with an adjustable cheek rest.