Not exactly cheap at $260
http://www.shop.ar15hardware.com/M16-Bolt-Carrier-Group-PHOS-CERM-16BCG.htm
Also side cocking at $260
http://www.fulton-armory.com/boltcarriergroupcompletesidecockingwhandle.aspx
http://www.shop.ar15hardware.com/M16-Bolt-Carrier-Group-PHOS-CERM-16BCG.htm
Also side cocking at $260
http://www.fulton-armory.com/boltcarriergroupcompletesidecockingwhandle.aspx