Stern Defense 9mm AR-15 Bolt, Mag-Phosphate

The Stern Defense 9mm bolt is engineered for Glock-pattern and mil-spec AR-15/M16 uppers. Constructed from 8620 AISI steel and finished with a mag-phosphate treatment, the bolt is intended for use with Glock magazines and Colt SMG magazine interfaces. It is compatible with standard AR-15/M16 charging handles and is supplied fully assembled with essential subcomponents installed.

Key Specifications

• The bolt is made from 8620 AISI steel for a balance of toughness and machinability.
• The finish on the component is mag-phosphate for corrosion resistance and functional durability.
• The bolt is chambered for 9mm cartridges as specified by the manufacturer.
• The component is compatible with Glock-pattern uppers and related Glock magazine interfaces.
• The bolt is listed for use with Glock magazines and Colt SMG magazine types.
• The assembly is compatible with standard AR-15/M16 charging handles.
• The bolt ships fully assembled with firing pin, firing pin spring, retaining pin, extractor, and extractor spring installed.
• The assembly includes proprietary center and roll pins as part of the bolt package.
• The listed dimensions are 2.40 x 2.45 x 7.70 (manufacturer-provided values).
• The product is marked as Made in the USA by the manufacturer.

Solidly built and purpose-driven, this Stern Defense bolt is appropriate for builders, gunsmiths, and armories assembling 9mm AR platforms that use Glock-pattern magazines. Its durable materials and factory-assembled components simplify installation and maintenance while supporting reliable function in compatible systems.