The Stern Defense 9mm Bolt for AR15/M16 in NIB/Mag-phosphate finish (brand part no. 004-SD BU9-NiB-ECHO-D2-M) is machined from 8620 AISI steel and built to fit both Mil-Spec and Glock-pattern 9mm upper receivers, giving PCC builders flexibility across two magazine ecosystems. The bolt functions reliably with Colt SMG-pattern and Glock-pattern magazines and stays fully compatible with standard AR15/M16 charging handles. It ships fully assembled, with the firing pin, firing pin spring, retaining pin, extractor, and extractor spring already installed, along with Stern Defense’s proprietary center and roll pins. The updated bolt design is engineered specifically to work well with single-stage triggers that have a short reset.

Key Specifications

• Machined from 8620 AISI steel.
• Finished with a NIB/Mag-phosphate coating.
• Fits both Mil-Spec and Glock-pattern AR9 upper receivers.
• Functions with Colt SMG-pattern and Glock-pattern magazines.
• Fully compatible with standard AR15/M16 charging handles.
• Ships fully assembled, with firing pin, spring, retaining pin, extractor, and extractor spring installed.
• Includes proprietary center and roll pins.
• Uses an updated bolt design suited to single-stage triggers with a short reset.

Frequently Asked Questions

What magazines does this bolt work with? Colt SMG-pattern and Glock-pattern 9mm magazines, depending on the upper receiver used.

Does it ship fully assembled? Yes, with the firing pin, spring, retaining pin, extractor, and extractor spring already installed.

Does it fit standard AR15/M16 charging handles? Yes, it is fully compatible with standard charging handles.

Buy the Stern Defense 9mm Bolt

Complete a 9mm AR9 upper with a fully assembled bolt built for both Mil-Spec and Glock-pattern receivers. Browse more Stern Defense parts in our other gun accessories and parts selection and order direct from our Lubbock, Texas gun shop for fast shipping to your door.