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Convert your standard mil spec AR 15, M4, M16 lower assembly to use 9mm and .40 S&W Glock Magazines!  The Mag-AD series adapters install in seconds.  Boasting a last round hold open feature making them a breakthrough product and a must-have for law enforcement and civilian gun enthusiasts alike.

The Stern Mag-AD9 series adapters are made of aircraft grade aluminum, lightweight with ergonomic design.   

Note: These adapters require the use of a 9mm or 40S&W barrel, "depending on chosen caliber" and a Glock cut bolt.


Looking for a complete conversion kit?  We have you covered.
Click Here.

Already have a Colt Style bolt and want to use our system?  We have you covered.
Click Here

Don't Have a bolt, want one?  We have you covered.
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Don't Have a barrel, want one?  We have you covered.
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Technical Information:

⦁    Made in the U.S.A.

⦁    Constructed from 6061 T6 aircraft grade aluminum.

⦁    4140 NiB coated feed ramp.

⦁    Hard coat anodized type 3.

⦁    Sturdy Construction.

⦁    Ergonomic mag release.

⦁    Works with all generations of Glock magazines.

⦁    Works with any mil spec ar15 lower receiver.

⦁     All gun components besides the Bolt and Barrel remain stock

Please visit the following link before purchasing to ensure compatibility with your setup.






10 Reviews Hide Reviews Show Reviews

  • 5
    AR 9MM conversion

    Posted by Steven Walker on Jul 27th 2019

    This worked great with my PSA lower and 9MM upper. Only 1 jam out of 100 rounds but appeared to be due to the magazine I was using. I would recommend!!

  • 5

    Posted by Timothy Stone on Jul 19th 2019

    This item is well made and works exactly as advertised. A lot of thought , engineering and craftmanship was applied in building this adapter. There are other adapters out there but looks , function, fit and finish can't hold a candle to the Stern Defense Mag adapters. I have 9mm and 45 ACP. Love them both.

  • 5
    AR 15 Glock 9mm magazine adapter

    Posted by Huey Nguyen on Jul 18th 2019

    Product is built reliable with easy installation. Very sturdy and high quality product.

  • 5
    AD9 magwell adapter

    Posted by Casey on Jun 24th 2019

    Shut-up and take my money! This was hands down one the greatest inventions for magazine adapters. It's rock solid, easy to install, and ran flawlessly.

  • 5

    Posted by Eric N Costello on May 13th 2019

    excellent item well done guys you beat the competition

  • 5
    No problems, quick and easy!

    Posted by Ryan Ramirez on May 9th 2019

    Kick Ass!!!!

  • 5

    Posted by Victor Froberg on May 6th 2019

    This adaptor is the best money can buy!! It’s so well made and designed! 1 word to describe it...Amazimg!

  • 5
    Great design easy to swap out if needed

    Posted by william register on Apr 16th 2019

    Out standing

  • 5
    9mm Adapter

    Posted by Michael Roll on Apr 11th 2019

    The Mag-AD9 worked great right out of the box. I could not be happier with my purchase.