The Luth-AR Modular Buttstock Assembly (MBA) MBA-2 is designed for AR-15 style rifles. This fixed stock replaces the standard buttstock and is compatible with a standard A2 rifle style buffer tube. The MBA-2 features a lightweight and durable construction made from black glass reinforced nylon. Unlike the MBA-1, it does not offer adjustability, making it suitable for users who prefer a more straightforward design. The modular nature of the MBA allows for customization as needed, although it is not interchangeable with carbine rifles that have telescoping assemblies.