The Stern Defense 9mm Bolt (brand part number 004SDBU9D1M) is machined from 8620 AISI steel and finished with a durable mag-phosphate coating, built to fit both Mil-Spec and Glock-pattern AR-15/M16 upper receivers. It functions with Colt SMG-pattern magazines as well as Glock magazines, and it’s fully compatible with standard AR15/M16 charging handles, so it drops into an existing 9mm pistol-caliber build without hunting down proprietary parts. The bolt comes fully assembled with every sub-component installed, including the firing pin, firing pin spring, retaining pin, extractor, and extractor spring, plus Stern Defense’s proprietary center and roll pins. It also incorporates the newer bolt design built to work well with single-stage triggers that have a short reset.

Key Specifications

• Chambered for 9mm pistol-caliber AR-15/M16 builds.
• Fits both Mil-Spec and Glock-pattern upper receivers.
• Runs Colt SMG-pattern or Glock magazines.
• Compatible with standard AR15/M16 charging handles.
• Machined from 8620 AISI steel.
• Finished with a mag-phosphate coating for corrosion resistance.
• Ships fully assembled, including firing pin, spring, retaining pin, extractor, and extractor spring.
• Includes proprietary center and roll pins.
• Uses a newer bolt design suited to single-stage triggers with a short reset.

Frequently Asked Questions

What magazines does this bolt run? Colt SMG-pattern or Glock magazines, in an upper machined for that magazine cut.

Does it come fully assembled? Yes, it ships with every sub-component installed, including the firing pin, extractor, and springs.

What is the bolt made from? 8620 AISI steel with a mag-phosphate finish.

Buy the Stern Defense 9mm Bolt, Mag Phosphate 8620 Steel

Order this bolt from our Stern Defense lineup, part of our rifle parts selection, at our Lubbock, Texas gun shop for fast, direct shipping.