Guntec USA AR .308 Nickel Boron Bolt Carrier Group - Mil-Spec

Manufactured by Guntec USA
Manufactured by Guntec USA
2 Reviews

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Finish your AR-10 build or upgrade your old one with the Guntec USA .308 bolt carrier group. This BCG is designed for tough use with its hardened steel bolt, firing pin, and extractor that won't break under stress. The carrier is made from 8620 steel and has a Nickel Boron coating that is harder than chrome and more slick allowing you to shoot longer between cleaning. It also makes cleaning easier as the carbon buildup will simply wipe off. The gas keys are also properly staked to ensure it won't back out over time. This drop-in bolt carrier assembly is easy to install and offers a dramatic improvement over Mil-Spec parts.

  • Made for 7.62X51 / 308 Cal
  • Hard Nickel P+ Finish
  • HPT/MPI Tested and Marked
  • 9310 Hardened Steel Bolt,
  • 17-4 Stainless Steel Firing Pin (Heat treated to H900 Condition)
  • 8620 carrier and gas key.
  • Hardened extractor S7 tool steel.
  • The group comes fully assembled with properly torqued and staked gas key
  • Made in the USA

Guntec USA has been designing, manufacturing, and distributing tactical weapon accessories since 1989. Their goal is to supply excellent quality, at an economical value to professionals and enthusiasts alike.
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Bolt FinishNickel Boron
Bolt Material9310 Steel
BrandGuntec USA
Caliber Gauge.308 Win
Carrier FinishNickel Boron
Carrier Material8620 Carpenter Steel
Carrier StyleDPMS Pattern Carrier
High Pressure TestedHigh Pressure Tested
Magnetic Particle InspectMagnetic Particle Inspected

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

Ratings & Reviews

2 reviews

  • 4 stars
  • 0 reviews
  • 2 stars
  • 0 reviews
  • 1 star
  • 0 reviews

Weak extractor. Will break in the first 250 rounds of use.

by -

works okay for the first couple hundred rounds. but about 220 rounds in the extractor broke on it. Just running 150gr factory loaded .308 ammo in it.

Works well so far!

by -

Has been great so far. Used this with a BA 6.5 Creedmoor barrel. Has been cycling flawlessly and headspacing was great. I did upgrade the extractor to the JP enhanced extractor. The one that came with it looked fine. I just wanted the extra security considering I’ve seen a few reviews stating the extractor is weak.