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ADK Arms - 223/5.56 Bolt Carrier Group, Nickel Boron

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Our Price: $139.95
Sale Price: $134.95
Savings: $5.00

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Product Code: 332-100-NIB
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Description Product Disclaimer Extended Information
ADK Arms tried and true 223/5.56 bolt carrier group is engineered and designed to the highest tolerances and military specifications and beyond. Nickel Boron finish ensures long term durability and lubrication. This item comes with an extra phosphate extractor.

Friendly Reminder: Always check your head spacing.

Recommended Ammunition:

Never use damaged, bent, corroded, dirty, wet, or oiled ammunition.

You should only use commercial grade ammunition in its original packaging which corresponds with the caliber that is imprinted on the gun.

Do not use refurbished, reloaded, hand-loaded, or non-standard ammunition of a different caliber.

  • Carrier:

    -AR-15 carrier DPMS compatible

    - 8620 heat treated (case hardened to SAE-AMS-6875).


    - 9310 Heat treated (case hardened to SAE-AMS-6875) QPQ to AMS-2753C.
    - Shot peened precision ground diameters.

    - Magnetic particle inspected to ASTM E1444 aircraft quality inspection procedure for molecular soundness and longer life of the Bolt.


    - Aircraft quality alloy steel shot peened.

    - Heat treated to military drawing specification SAE-AMS-6875.

    - Phosphated to of MIL-STD-171.

    Gas key:

    - Gas key bolt, grade 8 fully knurled.

    - Gas key, aircraft quality steel heat treated to SAE-AMS-6875 QPQ HT PROCESS .

    Cam pins:

    - Precision machined.

    - Heat treated to SAE-AMS-6875.

    Firing pin:
    - Machined and precision ground for accuracy

    - Heat treated to military drawing specification per SAE-AMS-6875

    - Chrome lined per 1.2.2 of mil-std-171

    Firing pin retaining pin:

    - Unique designed custom steel pin contouring the carrier body.

    - Heat treated to SAE-AMS-6875.

    - Phosphated to of MIL-STD-171.


    - Precision machined.

    - Heat Treated to SAE-AMS-6875.

    Gas rings:

    - Stainless Steel 3 Piece.


    To assure the highest degree of consistency and reliability, ADK Arms invests in premium extractor springs from Tactical Springs LLC / Sprinco USA along with a Mil-Spec Black Viton Extractor O-Ring per MIL-R-83248C. The springs are constructed from Chrome Silicon wirestock, a high tensile strength alloy ideally suited for high heat and high cyclic rate applications. The springs are heat treated, stress relieved, moly-plated, and most importantly, Cryogenic Processed post winding. While Cryogenic Processing typically extends the duty cycle of Chrome Silicon springs 3X - 7 X, these extractor springs have proven to surpass that multiplier. Unlike Music Wire or 17-7PH Stainless extractor springs which can require replacement at 2,500 to 5,000 round intervals for maximum reliability, this is likely to be the only extractor spring you’ll require for the life of the bolt! Numerous accounts have been recorded from customers with round counts in excess of 100,000 cycles on a single spring and O-ring with no noticeable degradation in performance. You’ll go through a number of barrels and extractors along the way to reaching that level, but the spring and O-rings can stay along for the ride.

    Results may vary, but ADK Arms has spared no expense in our commitment to provide you the very best in long term performance and reliability of our products! Go here for more information on these springs.

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