As stated above these are absolutely brand new and unused, complete bolt carrier groups, just lube them up, install them in your upper, and start shooting.
The BCM BCG's are now sold out
and I have two of the Lewis Machine and Tool (LMT) BCG's left to sell.
. The LMT's enhanced carriers use new BCM bolts, cam pins, firing pins and retainer pins. The BCM BCG are priced at $150 each delivered. The LMT enhanced BCG are priced at $180 each delivered. No further price reductions on these items and no trades are needed at this time. Payment would be by a USPS or bank money order or by paypal (you pay any fees). Here are some links with more information on the items.