Stern Defense 004-SD 9mm Hybrid Bolt Carrier
Stern Defense 9mm bolt carrier with NIB/Mag-phosphate finish on 8620 steel. Mil-Spec compatible, works with Colt SMG and Glock magazines. Fully assembled with firing pin, extractor, and springs included.
Stern Defense 9mm Bolt Carrier
The Stern Defense 004-SD represents a thoughtful approach to 9mm AR platform reliability. Built from 8620 AISI steel and finished with a durable NIB/Mag-phosphate coating, this bolt carrier is engineered for shooters who demand dependable performance.
Compatibility and Function
Universal Platform Support
- Fits Mil-Spec and Glock-pattern upper receivers
- Functions with Colt SMG and Glock magazines
- Fully compatible with standard AR15/M16 charging handles
What's Included
This bolt carrier arrives fully assembled and ready to install. Every critical component is pre-installed:
- Firing pin with spring and retaining pin
- Extractor with extractor spring
- Proprietary center and roll pins
Design Considerations
The 9mm bolt incorporates a modern design optimized for single-stage triggers with short resets. This attention to trigger interface makes for crisp, predictable trigger breaks—a feature that matters whether you're running precision drills or casual range sessions.
The NIB/Mag-phosphate finish provides excellent corrosion resistance while maintaining the aesthetic appeal shooters expect from quality components. Installation is straightforward for anyone familiar with AR platform maintenance.
