Have three AR15 bolt carriers, unmarked, parkerized, staked key bolts, full rear ring. They all look new, but I've fired and cleaned at least one of them without malfunction. Two have the relief cut under the firing pin, one doesn't. No signs of wear, rust carbon or handling dings.
Want to trade them for three new, or as-new, M16 bolt carriers of top quality. A "C" mark would be a big plus, for which I'll pay an extra $20 per bolt plus trade. I'm in the Feedback thread.