The NBS Mil-Spec Buffer Tube is a quality Receiver Extension (AKA Buffer Tube) machined from high strength American 7075-T6 Aluminum. This is a 6 position design and is a finished with Type 3 class 2 Hard Anodizing. It features incredibly smooth interior machining for quiet operation and less “sprioing” sound.
NBS Mil-Spec 6 Position Receiver Extension / Buffer Tube
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My 9mm AR was having trouble with the buffer hanging up. It seemed the threads on the buffer tube were pretty sloppy allowing it to get cocked sideways, and the lock ring could not keep a tight fit. I purchased this one and right away noticed the threads into the lower were much tighter with very little play and the lock ring threaded on much tighter also. This part solved my problem, no more hang ups. Very nice finish and well made.