Fully Adjustable Buttstock assembly to mount to a rifle (A2 Round Standard Tube). This is our fixed stock – Additional 1 height on cheek rest – Additional 1 1/16 length of pull with extended length buttplate – Approximately half the weight of competitor’s adjustable stocks. The MBA weighs just 1.26 lbs. – Fits all .223 and most .308 AR style rifles – Super Strong Glass Filled Nylon – Comes with A1 Buttstock screw to connect to A2 standard buffer tube – Incorporates Castle Nut and Lock Ring in the design – Easy to replace and quick to install – Features: – Modular buttstock assembly for the AR – Interchangeable with standard A1 or A2 buttstocks or any aftermarket buttstock with overall length of approximately 10.5 – Fully Ambidextrous and can be comfortably used shooting off either shoulder (Cheek piece pre-installed for right handed shooters but can be installed on either side for right or left hand shooters) – Cheek piece not only moves up and down it also moves back and forth on the stock – NOT interchangeable with carbine/collapsable rifles with telescoping assemblies (6-position tubes). You will need to purchase a MBA-3 or MBA-4 to fit these carbine tubes