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Black Nitride 556 Bolt Carrier Group

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5 out of 5 based on 1 customer rating
(1 customer review)

$149.99 $124.99

5 out of 5

AR15 / M16 Mil-Spec Bolt Carrier Group Assembly .223/5.56 – Black Nitride. Full Auto Design – Will operate as a semi-auto bolt carrier in all semi-automatic rifles. The full auto design is vastly more popular even in semi-auto firearms due to the smoothness of the cycling operation and the ruggedness of construction. Basically it works better and last longer. Does not change the designation of the rifle.

Made in USA

Out of stock

SKU: AZM-556-BLKN-MIL. Categories: , .

Product Description

Black Nitride 556 Bolt Carrier Group

Black Nitride 556 Bolt Carrier Group:  AR/M16 Mil-Spec Bolt Carrier Group Assembly .223/5.56 – Black Nitride. A high quality and very affordable drop in bolt carrier group for all .223 / 5.56 or .300 Black Out. These BCG’s are used successfully in commercial and military builds around the world. Unlike less expensive Phosphate finished BCG’s these have a Black Nitride finish. Parts finished with the Nitride process have increased wear-resistance, fatigue strength, corrosion resistance, lubricity and cosmetic appeal. These BCG’s run smooth and have a great look and feel. Builders love them.

This BCG Is Nitride coated and is manufactured as a full auto bolt carrier.  All full auto bolt carriers will operate as a semi-auto bolt carrier in a semi-automatic rifle. The full auto design is vastly more popular even in semi-auto firearms due to the smoothness of the cycling operation and the ruggedness of construction. Basically it works better and last longer. Does not change the designation of the rifle.

Carrier:
•M16 style (Auto)
•Machined from 8620 tool steel
•Heat treated to military specifications

Bolt:
•Machined from 9310 tool steel
•Heat treated to military specifications
•Shot Peened
•Ground to meet military required tolerances
•MPI (Mag Particle Inspected)

Gas Key:
•Machined from 4140
•Heat treated to military specifications

Extractor:
•Machined from 4140
•Heat treated to military specifications
•Shot peened

Firing Pin:
•Machined from 8640 tool steel
•Heat treated to military specifications
•Ground to meet military required tolerances
•Coated with .0002”-.0003” of hard chrome per MIL-STD-171 1.2.2.2

Cam Pin:
•Machined from 4340
•Quench and temper heat treat
•Ground to meet military required tolerances

See our other 556 / 223 products here!

Made in the USA

1 review

  1. 5 out of 5

    :

    I have to say out of all the BCG’s i’ve used in the past this one is awesome. The staking on the gas keys is done well and the black nitride finish definitely helps when it comes to reliability and cleaning. The materials used are above mil spec and for the price its hard to beat

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