I have two std Ar15 bolt carriers complete; both are unmarked and in good shape with 95% or better finish.
Both are chrome lined, one came out of a CMMG 10.5inch upper, the other from a Bushmaster 14.5 1/7 M4 upper.
$100 shipped for the Bushmaster's B/BC complete approx 2000rds fired
$110 shipped for the CMMG B/BC complete approx 700rds fired
or trade carriers alone for M16 carriers.