AERO PRECISION Rifle Carbine Buffer Tube for AR-15 BlackSpecifications Item Weight (lbs): 0. 260 Buttstock Fit: Carbine Material: Aluminum Buffer Tube Type: Rifle Quantity: 1 Color: Black Make Model Fit: AR 15. Universal; AR 308. Universal Description Aero Precision has buffer tubes for your carbine build or your rifle build. Both are made from 7075 aluminum and are 6 position adjustable. The Rifle buffer tube is mil spec is for A2 or A4 style rifles with a fixed buttstock. Either extension is perfect for