This is a Luth-AR Buffer Tube Complete Assembly, model BAP-1.
Luth-AR's Fixed Rifle Length Buffer Tube Complete Assembly Kit includes everything for a new .223 AR15 Rifle build or to convert your current AR15 Carbine to an A2 AR15 Rifle buffer tube recoil system
Features:
Kit includes a A2 Rifle Buttstock extension tube Standard .223 Rifle Buttstock buffer spring and a Standard rifle buffer body assembly