NBS AR-15 .223/5.56 Bolt Carrier Group - DLC - 9669
Only 4 left in stock
The NBS .223/5.56 DLC 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 DLC Coated, so that it can provide a long-lasting experience, and provide a significant upgrade to your AR-15.
DLC is quickly becoming one of the most desirable finishes for critical weapon components for the following reasons:
- Hardness (Rockwell) – Greater hardness rating compared to unpolished Nickel Boron (90RC vs 82RC)
- Coefficient of Friction – Lower coefficient of friction compared to Nickel Boron (.15 vs .5-.8)
These BCG’s have also been Magnetic Particle Inspected and have been made to Mil-Spec Standards. It also has17-4 H-900 Stainless Steel 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.
Technical Specs:
• Gas system: Direct Impingement
• Caliber: 5.56x45mm NATO/.223 Rem, .300 Blackout
• Finish: DLC
• Bolt: 9310 Alloy Steel (High Hardness)
• Carrier: 8620 Aircraft Grade Steel
• Extractor: Shot Peened and Case Hardened D2 Tool Steel
• Firing Pin: 17-4 H-900 Stainless Steel
• Gas Key: DLC coated 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 oz |
|---|---|
| Bolt Material | |
| Cartridge Compatibility | .223/5.56 NATO/.300 BLK |
| Finish | |
| Carrier Profile | M16 |
| High Pressure Tested | |
| Magnetic Particle Inspected | |
| Platform | AR-15 |
| Bolt Finish | Salt Bath Nitride |
| MPN | 9669 |
| UPC | 9669 |
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
- Reviews
- Questions
So nice, I bought twice
Both bcgs look great, surprisingly there are machine markings that differ between the two but nothing performance related. Oddly enough the firing pin retainer clip hole is bored much more on one of them. Added a Lantac SmoothCam and sprinco extractor springs (hugely different) and survived the first range trip without any signs of wear whatsoever. Cleans up very easily, even compared to my psa NiB bcg. Overall would buy again.
USFantastic BCG
All I want in a BCG is reliability and ease of cleaning. 5 stars in both categories for this item. Craftsmanship seems solid. I could literally wipe it clean with a paper towel. The DLC is very slick.
United StatesAfter 500 rounds. May be a lemon?
I did mention in a previous review, I bought 2 of these and noticed different machining marks and firing pin retaining pin cutout depths. Well the one in use on the 556 has just over 500 rounds on it. It still looks brand new on the exterior of the carrier. However I was cleaning the carrier and during one of mu checks the gas rings failed their check. I had notoced it degrading before but did not expect this at 500 rounds. I decided to check the wear on the free bore and bolt tail section in the carrier with a borescope and noticed it was wearing quite rapidly. Already through any DLC coating that made it in there. It looks pitted, rough/gouged and even discolored. I don't know if this is because of proper application of the vapor deposition dlc coating not getting the inside surfaces. I don't know how much this wear will continue at this rate but feel as though I shouldn't have to be worried about this at only 500 rounds. I hesitate to recommend.
AR15Discounts.com
Hey Josh, Thanks for leaving a review! To let you know, NBS is one of our house brands and comes with a lifetime warranty! Feel free and reach out to us with any issues you have with your BCG! Please email us at [email protected]
USDirty
When it arrived the bolt was hard to move. Had to take it apart and clean it completely. Disassembled it to get the grit out and lube it as it also showed up dry. At the end it works flawlessly. Nice unit
