Guntec USA has been manufacturing AR-15, AR-308 and AR 9mm accessories since 1989. Our goal is to distribute excellent quality, at an economical value.
- Made for 7.62X51 / 308 Cal
- 9310 Hardened Steel Bolt
- Hardened Extractor S7 Tool Steel
- Nickel Boron Finish
- 17-4 Stainless Steel Firing Pin (Heat treated to H900 Condition)
- The group comes fully assembled with properly torqued and staked gas key
- HPT/MPI Tested and Marked
- 8620 Carrier and Gas Key
- Made in the USA
Dan Clayton –
Having recently added the AR .308 Cal Nickel Boron Bolt Carrier Group MIL-SPEC BCG to my collection, I can honestly say it’s a standout piece for anyone looking to upgrade their firearm’s reliability and performance. The build quality feels solid and precise, reflecting the high standards expected from American-made accessories. The nickel boron finish is smooth and well-applied, not only giving it a sleek, professional look but also providing excellent resistance to corrosion and easier cleaning—an important factor for longevity and maintenance.
The machining on the BCG is crisp, with tight tolerances that ensure smooth operation. During testing, I noticed that the bolt cycle is notably cleaner and more consistent compared to some standard BCGs, contributing to better overall performance, even under extended use. It’s clear that durability and functionality were prioritized in its design, which is essential for those who rely on their AR platforms in various conditions.
One of the standout features is the MIL-SPEC design, which guarantees compatibility across a range of firearms and ensures a level of quality control that gun owners can trust. The deployment of nickel boron coatings is also a major plus—reducing friction and wear, and making cleaning less of a chore. It’s a worthwhile investment for anyone who regularly shoots or is interested in enhancing their build’s efficiency.
Value-wise, it’s a competitive product. Given its durability, finish, and American craftsmanship, it’s a reliable upgrade without breaking the bank. The installation was straightforward, fitting perfectly in my AR-10 with minimal fuss, which is always appreciated.
Overall, if you’re seeking a robust, high-quality bolt carrier group that’s built to last and performs reliably under demanding conditions, this AR .308 Cal Nickel Boron BCG is definitely worth considering. It’s a prime example of American manufacturing committed to quality, and it’ll give any serious shooter peace of mind knowing they have a dependable component in their rifle. Definitely a recommended addition for anyone looking to improve their AR platform’s performance and longevity.
Randy harshbarger –
Purchased this bolt an was more than pleased with fit an finish the bolt worked perfectly highly recommend
Randy –
Built a 308 ar-10 used a dealta team tactical nickel boron bolt had cycling problems an failure to feed , bought a Guntec nickel boron bolt gun run 100% perfect. Fit an finish is absolutely perfect way better than I expected, would highly recommend this . This company will be my go to from now on. I have used other products from this company an quality was great