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-Â 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
| Weight | 11.408 oz |
|---|---|
| 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
Always 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.
USBGC
Haven't fired it yet, but looks good. Nice even finish and good staking on gas key bolts and has o-ring on extractor spring.
USGREAT BCG
I recently bought this BCG in Black Nitride. It has five hundred rounds through it. No problems at the range yet. This BCG seems to work as good as some more expensive ones I have. I would recommend to friends. YOU CAN'T GO WRONG WITH AR15 DISCOUNTS.(PRICE AND SHIPPING ARE GREAT TOO!!!)
US300 blackout
It works still have not fired the weapon
USQuality manufactured BCG for the money
I bought 2x of these to try out and have been very pleased with the results. When they arrived I disassembled both BCGs and inspected them. Gas keys were properly staked, good machining, no metal burrs, and nice nitride coating. One had some pitting on the firing pin, and it was quickly replaced with another in excellent condition. I’ve tried these both out and they have been working great and reliably. I’m very happy with my purchase, and are a great buy if you can catch them on sale!
