Stern Defense 004Sdbu9D1M 9Mm Mag Phosphate 8620 Steel Ar15/M16

Building a 9mm AR platform rifle? The Stern Defense 004Sdbu9D1M is a complete 9mm bolt carrier for AR15/M16 builds that works with both Colt SMG and Glock magazines, giving you flexibility in ammo selection and feeding reliability. Machined from 8620 AISI steel and finished in phosphate, this bolt arrives fully assembled with all internals installed—firing pin, spring, retaining pin, extractor, and extractor spring—so you're ready to drop it into your upper right away.

If you're running a short-reset trigger system, Stern Defense engineered this bolt with single-stage triggers in mind. It's also compatible with the JP silent capture spring for shooters who prefer that setup. The bolt integrates with folding stock adapters and pairs well with Echo triggers, making it a versatile choice for compact or adjustable-platform builds.

Stern Defense manufactures this bolt domestically, and the phosphate finish provides a durable, matte black appearance with solid corrosion resistance. Whether you're assembling a 9mm plinker, a compact defensive rifle, or an integrally-suppressed build, this bolt handles the job without requiring any additional parts or assembly on your end.

Key Features

• Compatible with Colt SMG and Glock 9mm magazines
• Works with standard AR15/M16 charging handles
• Fully assembled with firing pin, extractor, springs, and retaining pin
• 8620 AISI steel construction for durability
• Phosphate finish in black
• Optimized for single-stage trigger systems with short resets
• Compatible with JP silent capture springs, Law Tactical folding stock adapters, and Echo triggers
• Made in the U.S.A.

Specifications

Frequently Asked Questions

Will this 9mm bolt work with my existing AR15 upper receiver?

Yes, the Stern Defense bolt is fully compatible with standard AR15/M16 upper receivers and charging handles. It's a complete carrier assembly, so you'll just need an appropriate 9mm barrel and magazine well insert (or dedicated lower receiver) to complete your build.

What magazines does this bolt feed from?

The bolt is designed to function with both Colt SMG and Glock 9mm magazines, giving you options depending on your magazine preference or inventory.

Is this bolt fully assembled, or do I need to install parts?

The bolt arrives completely assembled with all sub-components installed, including the firing pin, firing pin spring, retaining pin, extractor, and extractor spring. You can install it directly into your upper receiver.

Is this compatible with folding stock adapters or specialty triggers?

Yes, the bolt is compatible with Law Tactical folding stock adapters, JP silent capture springs, and Echo triggers, making it a flexible choice for specialized builds.