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This barrel is machined from 416R stainless steel, heat treated to RC 28-32 hardness, properly stress relieved, and finished with a highly corrosion resistant Salt Bath Nitride. BCA guarantees 1 MOA groups at 100 yards when observing proper shooting techniques and using high quality ammunition. Barrel CoatingSalt Bath Nitride Barrel ContourHBAR Barrel Length16 Barrel LiningSalt Bath Nitride Barrel Material416R Stainless Steel BrandBear Creek Arsenal Caliber Gauge300 BLK Feed RampsM4 Gas Seat Diameter.750 Gas System LengthCarbine PlatformAR-15 Thread Pattern5/8 X 24 Twist Rate1:8 from Primary Arms (Product B300CHB1618-SSBWF)

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