HD Defense Bolt Carrier Group M16 Profile Nitride Finish

$149.99 $119.99

  • M16 profile 5.56/223/300BLK
  • Nitrided throughout assembly, including carrier and key
  • 9310 Bolt (Properly heat treated yielding more toughness and better corrosion resistance than C-158 Steel)
  • MPI’d
  • Shot Peened
  • Mil-Spec Tool Steel Extractor w/ Crane (NAVSPECWAR) o-ring & spring
  • Mil-Spec Staking on the Keys
  • 100% Made in the USA
  • H&M Black Nitride plating for a deep, smooth black nitride finish

In stock

SKU: HDBCG Category:


Drop-In Assembly With Improved Strength & Durability from it’s GI counterpart.

Complete, assembly with bolt, bolt carrier, and firing pin ready to drop into the rifle or carbine upper of your choice.

Features a shot-peened bolt for increased surface strength and durability, and an extractor booster to ensure reliable cycling during rapid semi-auto or full-auto fire. Each assembly is magnetic particle inspected to ensure it’s free from imperfections that can result in failure. Properly staked gas key prevents leakage that can result in short stroking. M16-style carrier adds increased mass from traditional AR15 style and full-length shroud for tripping auto sear, and increased service life of firing pin. This carrier may be installed on all MILSPEC AR15 platforms including Semi-Auto, full-auto, Pre-Ban, or LE/Military Carbines/Rifles.

Understand, this is not one of the high volume, mass produced Bolt Carrier Groups that have a short operation expectancy. These are built to last, and we stand behind them.

What is Nitride?

BLACKNITRIDE™, or Ferritic Nitrocarburizing, is the thermochemical that simultaneously diffuses nitrogen and carbon into the surface of ferrous metals. During the process, a two-part surface layer is formed, an outer iron nitride layer with a nitrogen diffusion layer below it. During this treatment, nitrogen and carbon are absorbed by and diffused into the surface of the metal. Reproducible and uniform layers with a predetermined thickness will be formed on all areas of the metal. The result of this process is markedly improved surface properties on ferrous metal parts while maintaining dimensional and shape stability.

Metal components treated with BLACKNITRIDE™ have increased wear-resistance, fatigue strength, corrosion resistance, lubricity and cosmetic appeal. Often replacing the more expensive processes of hard chrome or nickel plating, BLACKNITRIDE™ gives better corrosion protection at equivalent or lower costs. Additionally, BLACKNITRIDE™ is commonly used as an alternative to high temperature conventional heat treatments such as carburizing and carbonitriding.


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