This is a Advanced Technology known as the Commercial, model A.5.10.1050.
The Advanced Technology Int. Commercial Buffer Tube Assembly fits most AR-15 and AR Variants. It is not compatible with AR10 or .308 Rifles. It is constructed of Military Type III Anodized" 6061 T6 Aluminum and is virtually indestructible. This package includes a steel castle nut and locking ring along with a AR-15 recoil plug and buffer spring. Made in USA.
Features:
Fits most AR-15 and AR Variants
Commercial Diameter Tube
Constructed of Military Type III Anodized 6061 T6 Aluminum;Virtually Indestructible