Rankin Industries SP4 Coated Bolt Carrier Group Mil Spec M-16 AR-15 5.56 Rankin Industries SP4 coated bolt carrier group has a new SP4 hybrid DLC coating that is the result of years of development. SP4 combines super high hardness of around 3000 HV with flexibility to remain tough without being … [Read more...]
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Tactical Gear for the Modern Day Gunslinger
