I have a perfect condition, top quality chrome M16 Bolt Carrier that I bought about 16 years ago when I wanted to put an A2 upper on my Colt SP1 Carbine. The carrier key has been staked properly. Because I used the Colt Bolt, when I took the larger barrel and A2 upper off to return the SP1 Carbine to original, I no longer have a bolt to go with the bolt carrier.