Stern Defense 004Sdbu9Nibechod2M 9Mm Nib/Mag Phosphate Hybrid 8620 Steel Ar15/M16

Building a 9mm AR-15 platform rifle requires a bolt carrier group specifically engineered for the cartridge and your magazine preference. The Stern Defense 9mm bolt is purpose-built for shooters running either Colt SMG or Glock magazine-fed 9mm uppers on standard AR-15/M16 lower receivers. This is a fully assembled bolt carrier—you get the complete package with firing pin, spring, retaining pin, extractor, and extractor spring already installed and ready to function.

What sets this bolt apart is its design philosophy around single-stage trigger integration. The geometry accommodates short-reset trigger pulls, which matters if you're running a precision match trigger or prioritizing fast follow-up shots. It also plays well with alternative components like JP silent capture springs, Law Tactical folding stock adapters, and Echo triggers—useful if you're building a compact or specialty configuration. The hybrid phosphate/nickel-boron finish balances durability and corrosion resistance without the higher cost of full nickel-boron, and it's manufactured in the U.S.

This bolt is compatible with all standard AR-15/M16 charging handles, so you're not locked into proprietary accessories. Whether you're assembling a dedicated 9mm dedicated lower or converting an existing upper, this is a straightforward, well-thought-out component for a common AR platform conversion.

Key Features

• Fully assembled bolt carrier group — firing pin, spring, retaining pin, extractor, and extractor spring installed
• Dual magazine compatibility: works with Colt SMG or Glock magazines
• Optimized for single-stage triggers with short resets
• Compatible with JP silent capture springs, Law Tactical folding adapters, and Echo triggers
• Works with all standard AR-15/M16 charging handles
• Phosphate/nickel-boron hybrid finish for corrosion resistance
• Constructed from 8620 AISI steel
• Made in the U.S.A.

Specifications

Frequently Asked Questions

Will this bolt work with my Glock and Colt magazines?

Yes. This bolt is designed to function with both Glock and Colt SMG magazines, giving you flexibility in magazine choice for your 9mm AR-15 build.

Is this bolt compatible with my existing AR-15 charging handle?

Yes. It works with all standard AR-15/M16 charging handles, so you don't need to source anything proprietary.

What comes included with this bolt?

This is a fully assembled carrier group. It includes the firing pin, firing pin spring, retaining pin, extractor, and extractor spring already installed and ready to use.

Can I use this bolt with specialty trigger groups or folding stocks?

Yes. The bolt is designed to work with single-stage triggers featuring short resets, JP silent capture springs, Law Tactical folding stock adapters, and Echo triggers.