AERO PRECISION AR-15 5.56 BCG Phosphate

Features:– M16-cut carrier – Machined from 8620 steel – Carrier has forward assist serrations – Mil-Spec phosphate coating – Properly staked gas key – Chrome lined gas key and bolt channel – 5.56 Bolt is machined from Carpenter 158 tool steel – Shot peened – HPT tested/MPI marked – Black o-ring insert on extractor – High quality AR-15 BCG – Weight: 11.52 oz – Carrier Material: 8620 Steel – Bolt Material: Carpenter 158 Tool Steel