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Rubber City Armory Blacknitride+ 6.8 SPC/.224 Valkyrie Bolt Carrier Group
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RISE Armament RA-1010 Low-Mass .223/5.56 Bolt Carrier Group – Nickel Boron
SLR Rifleworks Premium Bolt Carrier Group Titanium Nitride – 556
Aero Precision .224 Valkyrie/6.8 SPC Bolt Carrier Group, Complete – Black Nitride
Battle Arms Titanium M16 BCG With ArmorTi Coating AR15