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.