The Luth-Ar MBA-1 RFL/FXD STK BLK is a fully adjustable AR buttstock assembly designed to mount on the A2 round standard buffer tube, offering a rigid, lightweight solution that weighs just 1.26 pounds and uses super strong glass-filled nylon for durability. This fixed stock features an added 1 height on the cheek rest and an extended length of pull of 1 1/16 with the buttplate, delivering improved shooting comfort and alignment across AR-15 and AR-10 platforms that accommodate .223 and most .308 rifles. The MBA-1 is modular and interchangeable with standard A1 or A2 buttstocks and any aftermarket stock with an overall length near 10.5, and its fully ambidextrous design enables easy use from either shoulder, with a cheek piece pre-installed for right-handed shooters but adjustable to either side. The cheek piece moves both up and down and back and forth to fine-tune cheek weld, while the stocks build includes a Castle Nut and Lock Ring, easy swap-in with the A1 buttstock screw, and quick installation without tools. Note that this model is not compatible with carbine or telescoping 6-position tubes; for those applications consider MBA-3 or MBA-4. The Luth-Ar MBA-1 combines strength, adjustability, and ergonomic versatility for precise AR shooting.