Black Rifle Depot

.223/5.56 Bolt Carrier Group - Black Nitride

(30 reviews) Write a Review
SKU:
4300
UPC:
999994300
MPN:
516446953
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MSRP: $139.95
Now: $79.95
Was: $129.99
— You save $60.00

Description

.223/5.56 Bolt Carrier Group - Black Nitride

The .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 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. 

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

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Warranty Information

Standard
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Additional Information

MPN:
516446953
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
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30 Reviews

  • 5
    Bolt carrier group.

    Posted by Wade Konecny on May 9th 2024

    Works great. Looks even better. Have never had a problem with it.

  • 5
    Bolt carrier group.

    Posted by Wade Konecny on May 9th 2024

    Works great. Looks even better. Have never had a problem with it.

  • 5
    Review

    Posted by Grady on Dec 29th 2023

    great product, works great

  • 4
    Bolt and firing pin

    Posted by Joe Finn on Apr 6th 2023

    Picked this up for a back up, the price was to good to pass on.

  • 5
    Reliable carrier group swap out.

    Posted by The Kraken on Nov 28th 2022

    Needed a reliable carrier group to swap out in the event of carbon build up malfunction. Produced flawless cycle rate for 500 + rounds.

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