Premium quality Nickel Boron 5.56 Bolt Carrier Groups
These are the best you'll find on the market and fully polished prior to nickel boron coating.
Features:
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MPI Bolt (magnetic particle inspected)
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Carpenter 158 steel bolt (nickel boron coated)
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Shot peened bolt
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Grade 8 hardened fasteners
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8620 heat treated carrier, polished w/nickel boron coating
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Key staked per Mil-Spec
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UTC Nickel Boron Coated
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Made in USA
http://www.uctcoatings.com/capabilities/coatings/
