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Stern Defense AR15 Magwell Adapter for Glock Magazines
Stern Defense AR15 Magwell Adapter for Glock Magazines

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List Price: $249.99
Our Price: $199.99
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Product Code: MAG-AD9

Stern Defense AR15 Magwell Adapter for Glock Magazines

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. Glock mags used with this adapter must be Glock 19 length or longer.

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

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.

Will it work with this magazine?

Although the MAG-AD9 may work with many aftermarket magazines, we recommend using post 2004 square notch, Glock OEM magazines. As these will provide the best fit and function.


Please note the above picture, notice the lack of a ledge on the new magazine as compared to the old. Also please note the (SQUARE) shaped notch on the new magazine as compared to the (U) shaped notch on the far right magazine.

(U NOTCH) magazines are very early generation glock magazines, they were not fully metal lined and due to this they expand when loaded causing reliability and insertion issues.

2004 and prior magazines (SQUARE and U-NOTCH) also contain a ledge on the right hand side as noted by the above picture.

While in some situations these magazines can still be used with the MAG-AD9 series, they may require more force to seat the magazine or may not seat at all. Some very light modification can be done to the magazines to allow them to seat easier.

We still do not recommend the use of U-Notch magazines, as even with modification, they may not work or be reliable due to the lack of a full metal liner and expansion when loaded.

If you want to use these types of magazines, you can slightly modify the magazine in order to fit. See figures 1 and 2 below.

Figure 1

If you have these older magazines and wish to use them. Please note the areas of the magazines that will need modification .

Figure 2

If you wish to use these magazines, you can take a simple household file and bevel the indicated edges slightly ( green arrows as shown in figure 2.) This will allow the magazine to seat fully without excessive pressure. This should be done in small increments with test fitting and should not affect the use of the magazine in Glock pistols. DO NOT MODIFY THE AREA INDICATED BY THE RED BOX.

While we have experimented with this and have had zero issues. Stern Defense accepts no liability for modifications you make to your magazines, If you decide to do this you do so at your own risk.

Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 1 Write a review »

  0 of 0 people found the following review helpful:
5 of 5 January 13, 2019
Reviewer: james w from fort myers, FL United States  
Two Allen screws and it comes right out and you have the standard ar15 ready for cal changes real slick

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