Nickel Teflon Bolt Carrier Group BCG for AR-15

For the Ultimate in durability and reliability I give you AR-15 Nickel Teflon BCG.  Or AR-15 BCG in Nickel Teflon.  No need for lube, even in humid or dry environment, this will keep working!  Used by Special Forces for years as the secret to Long lasting durability with very little wear and tear.