The MBA-1 fixed Rifle Buttstock with .223/5.56 Buffer Assembly is a complete kit that includes everything needed to assemble an A2 rifle buffer system on your .223/5.56 AR lower. The kit includes an MBA-1 Buttstock that features adjustable Length-of-Pull and adjustable Cheek Rise in a lightweight affordable rifle buttstock. Comes complete with A2 Buttstock extension tube Standard Buffer and a .223/5.56 Buffer Spring. The modular design of the MBA Buttstock allows you to configure your buttstock to your specific and personal needs. The MBA features multiple attachment points for a sling including molded pockets that will accept Grovtec QD cups sold separately.