Ruger has taken an unique position concerning their Bolt Carrier Group. I was informed by a Ruger supervisor that the Bolt Carrier Group has to be custom fitted and will not be sold to any consumer per Ruger's Legal Department. Reasons stated for this, "Proper Head Spacing and Proofing" The rifle has to be sent back to Ruger for replacement. He also stated that if you send back the the rifle for a new Bolt Carrier Group, the original one will not be returned. The Ruger supervisor stated that "Ruger will not allow you to have a spare Bolt Carrier Group". I wanted to order one to keep as backup in the event (however unlikely) of a failure. I find this an unacceptable practice of Ruger and urge everyone who owns a AR 556 to call and complain or simply not to purchase one. I also asked the Ruger supervisor why spare parts for the AR 556 is not listed on the Ruger website, response, "We have not done it". I urge Ruger to update their policy concerning this issue and to update their website parts list so consumers can buy spare parts for their AR 556 without having to call Ruger.