Stern Defense Mag-AD9 9mm/.40 S&W Glock Magazine Adapter

Description

The Stern Defense Mag-AD9 is an AR-15 magazine adapter designed to allow standard mil-spec AR-15 lower receivers to accept 9mm and .40 S&W Glock magazines. It is constructed from 6061-T6 aircraft-grade aluminum and includes a 4140 nickel-boron-coated feed ramp.

The adapter works with Glock magazines across all generations and retains stock gun components other than the bolt and barrel. A Glock-cut bolt is required. When used with a carbine spring, the system must use a 5.4-ounce buffer or heavier; the buffer is not included.

Key Specifications

• The brand and model are Stern Defense Mag-AD9.
• The compatible cartridges are 9mm and .40 S&W.
• The adapter is designed for standard mil-spec AR-15 lower receivers.
• The compatible magazines are Glock magazines from all generations.
• The construction material is 6061-T6 aircraft-grade aluminum.
• The feed ramp is made from 4140 steel with a nickel-boron coating.
• The finish is Type 3 hard-coat anodized.
• The listed dimensions are 3.40 x 4.40 x 6.80 inches.
• The required buffer weight is 5.4 ounces or heavier with a carbine spring.
• The UPC is 860141001508, and the SKU was not provided.

Made in the USA, the Mag-AD9 provides a purpose-built interface between an AR-15 lower receiver and compatible Glock magazines. Its ergonomic magazine release, last-round hold-open feature, and durable aluminum construction support a practical, streamlined setup for compatible builds.

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Specifications