NBS .223/5.56 Bolt Carrier Group - Black Nitride - AR15-Bolt-Carrier-Group
In stock
The NBS .223/5.56 Black Nitride Bolt Carrier Group was designed with strength in mind. Starting with a 9310 Steel Bolt, which is aircraft-grade material, this bolt has a high core strength rating, a high fatigue strength, and a high hardenability rating. 9310 steel, when treated properly, is about 7% better than Carpenter 158 steel, so you know that you will have a dependable BCG, when you drop this into your rifle.
This NBS BCG (Bolt Carrier Group) has been Nitrided, so that it can provide a long-lasting experience, and provide a significant upgrade to your AR-15. These BCG’s have also been Magnetic Particle Inspected and have been made to Mil-Spec Standards. It also has Mil-Spec 8740 Steel hard-chromed Firing Pins, Mil-Spec Gas Keys with Grade-8 screws that are staked and sealed with Permatex No.3, and they have shot-peened case-hardened D2 tool steel extractors. Plus, with the AR15Discounts satisfaction guarantee, you can buy your AR build components without apprehension. Our guarantee says if you are unhappy for any reason, you can send it back to us within 30 days for a full refund. No worries.
NOTE- The Salt Black Nitride BCG offers the dark, subdued finish that doesn’t change the specs of the Bolt Carrier, but it still makes the outside of the Bolt Carrier harder. This treatment increases the longevity of the part, makes it extremely wear resistant and durable, and this treatment protects the part from corrosion.
Technical Specs:
• Gas system: Direct Impingement
• Caliber: 5.56x45mm NATO/.223 Rem, .300 Blackout
• Finish: Salt Black Nitride
• Bolt: 9310 Alloy Steel (High Hardness)
• Carrier: 8620 Aircraft Grade Steel
• Extractor: Shot Peened and Case Hardened D2 Tool Steel
• Firing Pin: Mil-spec 8740 steel with hard chrome finish
• Gas Key: Mil-Spec w/ properly staked Grade-8 screws & Permatex No. 3 sealed
• Cam Pin: 8620 Steel w/ Black Nitride Finish
• Quality Control: MPI Inspected for QC
NBS — Our In-House Brand for Builders Who Demand Reliable Performance and Real Value.
Designed for builders who demand reliable performance and real value without unnecessary hype or inflated pricing. NBS stands for "No Bullshit."
Built on Strong Industry Partnerships
Through the strong partnerships AR15Discounts has built with trusted suppliers and vendors, we regularly gain access to premium components often manufactured by or for leading industry names. By purchasing these in volume, we bring them to you under the NBS label, ensuring proven quality reaches your build at a fair price, without the added cost of extensive marketing.
Quality You Can Trust
Every NBS product is specified to the exacting standards we apply to our own rifles. Each component features precision CNC machining, American-made key components where it counts, robust materials, dependable steels, and durable finishes engineered for long-term reliability. These items are either sourced from reputable OEMs or carefully assembled in-house using established name-brand elements, maintaining consistent excellence throughout the lineup.
Complete Solutions for Serious Builders
From stripped and complete uppers to bolt carrier groups, handguards, lower parts kits, and beyond, NBS provides a unified, affordable selection that allows you to complete confident, high-performing builds.
Backed by a Limited Lifetime Warranty
All NBS products come with our Limited Lifetime Warranty for the original owner, covering defects in materials and workmanship. AR15Discounts stands firmly behind these parts because, as shooters ourselves, we use and trust them, delivering honest value and gear you can rely on.
| Weight | 11.408 oz |
|---|---|
| Dimensions | 7.7 × 1.4 × 1.4 in |
| Bolt Material | 9310 Steel |
| Cartridge Compatibility | .223/5.56 NATO/.300 BLK |
| Finish | Salt Bath Nitride |
| Carrier Profile | M16 |
| High Pressure Tested | Untested |
| Magnetic Particle Inspected | Magnetic Partical Inspected |
| Platform | AR-15 |
| Bolt Finish | Nitride / Melonite |
| MPN | AR15-Bolt-Carrier-Group |
| UPC | 4300 |
Compliance
NFA (National Firearms Act) compliance is crucial for legal ownership and transfer of regulated firearms and accessories like short-barreled rifles, suppressors, and certain types of ammunition, ensuring adherence to federal regulations to avoid legal penalties and ensure responsible firearm ownership.
Customer Reviews
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US
AR15 - M 16 bolt carrier
the Bolt carrier is awesome. i broke it down to make sure all is good, all ⭐⭐⭐⭐⭐i also got the same make 20" barrel to make sure the ramps work together, smooth the cycle, the 20" barrel was Not Pined, a gun smith has to do that, so add 50.00 + to the cost of the barrel, i will only buy full uppers now ready to go, just clean oil and rock on,
USGREAT BCG
Ive had good luck with NBS products so why not save some money.
USGood BCG
This is a good value mil-spec BCG. I use it in a rifle I recently built and it goes bang every time I pull the trigger. 'Nuff said...
US.223/5.56 Bolt Carrier Group
NBS .223/5.56 Bolt Carrier Group - Black Nitride works great with no problem.
USAlways keep a spare BCG, just in case
This is an excellent 5.56/.223 BCG for the AR-15. Well made, durable, cleans up easily and smooth operation. Great to have an extra BCG on hand.
