AR/M16 Bolt Carrier Group – Nitride


(8 customer reviews)

All E2 Armory products are competitively priced and include FREE E2 Armory stickers.


Out of stock

Join the waitlist to be emailed when this product becomes available

AR/M16 Bolt Carrier Group – Nitride

Your bolt carrier group (BCG) is the lifeline of your AR-15. Designed for AR-15 and M16 builds, this group features high-end retaining and firing pin, gas key, and expert assembly, machined from 9310 alloy and laser engraved.  The E2 bolt carrier group works better and provides longer lasting performance for your rifle build.

BCG Includes:

  • Bolt precision machined from 9310 alloy; carburized/case hardened & shot peened
  • Ultrasonically cleaned and Nitrided
  • Extractor, machined 4140 Tool steel alloy, hardened and Nitrided
  • Extractor Pin, precision machined and ground AMS6440/52100 Bearing grade steel retaining pin
  • Extractor Spring, 5 coil, ASTM Grade A 228 wire stock, stress relieved, Tensile Strength of 393,000 PSI Max, 80 Durometer Per AMS-R-6855 black insert
  • Extractor Spring O-Ring, Viton (FKM) Fluoropolymer Elastomer
  • Ejector, S7 shock resistant tool steel alloy, hardened, shot peened per ASTM B851/SAE AMS2430, manganese phosphate
  • Ejector Spring, ASTM Grade A 228 wire stock, heat treated, stress relieved – Tensile Strength of 376,000 PSI Minimum
  • Gas Rings, Steel Corrosion Resistant Per AMS 5906 – X3
  • Carrier machined from 8620 alloy, full auto profile, heat treated, ultrasonically cleaned and Nitrided
  • Gas Key machined from 4130 chromoly steel alloy, heat treated and Nitrided
  • Socket Cap Head Screw, steel, grade 4037 per ASTM, heat treated & manganese phosphate 2x
  • Gas Key is installed with Permatex aviation gasket sealer, torqued to 55-foot pounds, pneumatically steaked and break away tests performed to spec
  • Cam Pin, precision machined 4340 chromoly steel alloy, heat treated and Nitrided
  • Firing Pin, precision machined 8740 steel alloy, heat treated, precision ground & hard chrome plate
  • Firing Pin Retaining Pin, carbon steel ASTM A510, heat treated & manganese phosphate
  • All material, components and packaging made in the USA

What’s Included:

(1) AR/M16 Bolt Carrier Group – Nitride

E2 Armory is committed to providing the highest quality firearm components that meet all rigorous military specifications while being competitively priced and rush delivered. Our customers are provided products that could be used for the defense of liberty and freedom across the globe. E2 Armory employs only the highest caliber employees that are devoted to continual improvement and bar setting quality. We are excellence.


E2: Distributing Freedom.

Weight .93 lbs
8 reviews for AR/M16 Bolt Carrier Group – Nitride
  • (verified owner)

    I just received this E2 nitride BCG it looks decent overall but the bolt only had two gas rings installed. Of the seven BCGs and two spare bolts I have, this is the only one that showed up with two gas rings installed. It didn’t exceed my expectations.

  • (verified owner)

    Excellent product all the way around. Staking is perfect. Gas rings positioned correctly. Go-No Go head spaced without issue.
    Used in a brand new .223/556 AR 7″ pistol setup. Full Break in took about 30 rounds, now with 500 rounds and no problems what so ever.
    Shipping time was 7 days from order to arrival.
    Thank you e2 for a nice product at a great price.

  • (verified owner)

    Recently I received this product and it looked pretty good overall. However upon further inspection, there was a slight issue. After some communication they resolved the issue without question. The resolution ”exceeded my expectations” and it is customer service like this that earns respect and consideration for further purchases. Once I get a chance to test it out, i’ll swing back by and let you know how it performed.

  • (verified owner)

    Excellent budget BCG best one for the money and cheapest around get them while you still can. My two units work perfectly buddies also working fine just always out of stock. Get on mailing list.

  • (verified owner)

    Great price, and quick shipping. I purchased this BCG for my 7.5” 300 blackout pistol build. I haven’t had time to get to the range due to the ammo shortage but I will post my full review once I can.

  • (verified owner)

    Ordered two, Nether had any kind of engraving, No marks of any kind, No marks for Bolt either, Both look like toy’s, Machining and quality look bad, No Chrome lining in carrier or anywhere I can find, Including the Gas key. They look like China made poor copies to be honest. I Won’t be trying these. Basic Anderson bcg’s look 10x the quality.

  • (verified owner)

    5 out of 5

    I bought 4, they were individually packaged in some type of shrink wrap. Staking looks very good. Bolt is marked HPT/MPI on all and no E2 logo or any other markings. 100% nitride finish on bolt/carrier/gas key. Gas ring tension is excellent, all rings present. Only 1 sticker came in the box.

  • (verified owner)

    1 out of 5

    Ordered 1. Mine wasn’t engraved either. Not a deal breaker. Bolt marked MPT/MPI. Bolt carrier not polished. Ordered the Nitride finish model. Nitride finish looked rough like phosphate except if it wasn’t phosphate. If it was, inside of gas key should be chromed, but it wasn’t. When Nitride finished, chrome is not needed. This is the deal breaker. The four carrier rails have the same rough finish as the rest of the carrier. BCG’s I’ve purchased from other manufacturers polish the carrier rails. Nitride is a treatment, not a coating so the roughness is not caused by the Nitride, it’s the condition of the metal. Steel is harder than aluminum. The rough carrier rail, I fear, will grind up the upper receiver aluminum. I emailed E2 so I’ll see what happens next. The website said no returns. Will I end up with an expensive paper weight?

Customers review
8 ratings
Rate it!

Only logged in customers who have purchased this product may leave a review.

Write A Review