BCM Bolt Carrier Auto M16
a fair deal on some bolt carriers. good quality stuff. the key is supposed to be fully chrome lined. my latest LMT carrier has no chrome in the key-- where the older ones do along with the colts.
i suspect LMT makes these BCMs along with DD's--although this is just scuttlebutt.
although i can't see that the lack of chrome in the key affects function in any way it is good to have the chromed lined keys in the old school way.