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Stern Defense MAG-AD9 AR-15 Glock 9mm/.40 Magazine Conversion Adapter 001-SD MAG-AD9-GLOCK-9AND40-M Color: Black, Finish: Hard Coat Anodized Type 3, $12.60 Off Plus Blazin' Deal w/ Free Shipping

Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M
Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M
Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M
Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M
Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M
Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M
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Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M
Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M
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Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M
Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M
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Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M
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Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M
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Questions & Answers
This might seem like dumb question but here goes. I want to convert my AR to shoot Glock 40. Besides this kit, I would have to buy a barrel, correct? Expert Answer

You would need a barrel, a BCG, and most likely a heavier buffer.

by Jonathan D., Gear Expert, September 23, 2019
See 2 More Answers
Will S&W magazines work with this?

This MAG-AD is for glock magazines. You will need the MAG-ADMP9&40/P20 one for 9mm S&W magazines.

by Stern Defense, Verified Owner, July 21, 2025
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
Stern Defense has the best customer servise! by Hunter, Verified Owner, August 29, 2019
Purchase this adapter for my AR 9 build. Had issues with jamming if I put more than 3 rounds( didn't matter if flat or round nose) in the mag. Re-installed the adapter three times and had the same result every time. Called Stern Defense left messa...
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30/30 found this helpful
Helpful Positive Review
Excellent fit and finish by John Greco, Verified Owner, February 28, 2025
This adapter fits perfectly in my 5.56mm lower. Glock magazines fit with ease and the mag release is in the perfect spot.
1/1 found this helpful
Helpful Positive Review
so far so good by Maurie, Verified Owner, April 22, 2025
Two trips out and has worked flawlessly, very happy with it
1/1 found this helpful
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Sterner 9mm conversion by Hawks, Verified Owner, August 21, 2025
I had another 9mm conversion adapter, and had enough issues. Double taps without trying, failure to feeds, frustrated. Ran this , and so far no issues so far.
1/1 found this helpful
Helpful Positive Review
It Just Works! by Erwin, Verified Owner, February 21, 2025
I bought this for my first AR-9 build since I had a couple spare lowers and didn’t want to spend money on a dedicated 9mm lower. I did also order Stern’s Glock compatible bolt just to be on the safe side. I have had it in and out of a receiver two ...
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Helpful Positive Review
Works very well (if you install it correctly) by pazmaker, Verified Owner, January 17, 2021
I installed the Stern Defense MAG-AD9 in an 80% lower that I finished and it works very well. I suspect a lot of the negative feedback is due to improper installation. Sure, follow the instructions, but you have to understand how the adapter, especia...
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15 Ways to Upgrade with Stern Defense! Save on Special Selection of Stern Defense Products

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Blazin' Deal
Prices have been cut drastically on this product as part of a special offer. These prices are so low that there's no double-dipping with coupons or any additional discounts, but you'll still get the best deal out there. This offer won't last long, so don't miss out!
Color:
Black
Finish:
Hard Coat Anodized Type 3
Gun Model:
AR-15, Glock 17, Glock 21, Glock 23, M4, M16
Caliber:
9mm Luger
Magazine Capacity:
0 Round
Magazine Type:
Pistol
Condition:
New

Code: 3JS-CNC-SDMA9-001-SD-9AND40-M-0RD

MPN: 001-SD MAG-AD9-GLOCK-9AND40-M

UPC: 860141001508

Blazin' Deal
List: $179.99Save $12.60
$167.39

Product Info for Stern Defense MAG-AD9 AR-15 Glock 9mm/.40 Magazine Conversion Adapter

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.image

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

Specifications for Stern Defense MAG-AD9 AR-15 Glock 9mm/.40 Magazine Conversion Adapter:

Manufacturer: Stern Defense
Color: Black
Finish: Hard Coat Anodized Type 3
Fabric/Material: 6061 T6 Aircraft Grade Aluminum
Gun Make: AR Platform, Glock
Gun Model: Glock 17, Glock 21, Glock 23, M16, M4, AR-15
Caliber: 9mm Luger
Magazine Capacity: 0 Round
Magazine Type: Pistol
Magazine Included: No
Condition: New

Features of Stern Defense MAG-AD9 AR-15 Glock 9mm/.40 Magazine Conversion Adapter

  • Ergonomic Mag Release
  • Work with all generations of Glock Magazines
  • Works with any Mil Spec AR15 Lower Receiver
  • All Gun Components Besides the Bolt and Barrel Remain Stock
  • Uses Glock 9mm Magazine
  • Sturdy Construction
  • 4140 NiB Coated Feed Ramp

Package Contents:

  • Stern Defense MAG-AD9 AR-15 Glock 9mm/.40 Magazine Conversion Adapter

What firearm models does the manufacturer say Stern Defense MAG-AD9 AR-15 Glock 9mm/.40 Magazine Conversion Adapter is compatible with?

The manufacturer says that Stern Defense MAG-AD9 AR-15 Glock 9mm/.40 Magazine Conversion Adapter is compatible with AR-15, M4, M16, Glock 23, Glock 21, Glock 17

Stern Defense MAG-AD9 AR-15 Glock 9mm/.40 Magazine Conversion Adapter Orderable Models

List of Orderable Models

  • Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M , MPN: 001-SD MAG-AD9-GLOCK-9AND40-M , UPC: 860141001508 , Code: 3JS-CNC-SDMA9-001-SD-9AND40-M-0RD

Stern Defense MAG-AD9 AR-15 Glock 9mm/.40 Magazine Conversion Adapter Unavailable & Discontinued Models

List of Unorderable Models

  • DEMO, Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M , MPN: 001-SD MAG-AD9-GLOCK-9AND40-M-DEMO , Code: 3JS-CNC-SDMA9-001-SD-9AND40-M-0RD-DEMO
  • DEMO, Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M , MPN: 001-SD MAG-AD9-GLOCK-9AND40-M-DEMO , Code: 3JS-CNC-SDMA9-001-SD-9AND40-M-DEMO-0RD
  • USED Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M, EDEMO17, Used, Condition Like New , MPN: 001-SD MAG-AD9-GLOCK-9AND40-M-EDEMO17 , Code: 3JS-CNC-SDMA9-001-SD-9AND40-M-0RD-EDEMO17
  • USED, Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M , MPN: 001-SD MAG-AD9-GLOCK-9AND40-M-EDEMO , Code: 3JS-CNC-SDMA9-001-SD-9AND40-M-0RD-EDEMO-OT-U
  • USED Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M, EDEMO16, Used, Condition Fair , MPN: 001-SD MAG-AD9-GLOCK-9AND40-M-EDEMO16 , Code: 3JS-CNC-SDMA9-001-SD-9AND40-M-0RD-EDEMO16
  • USED Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M, EDEMO18, Used, Condition Fair , MPN: 001-SD MAG-AD9-GLOCK-9AND40-M-EDEMO18 , Code: 3JS-CNC-SDMA9-001-SD-9AND40-M-0RD-EDEMO18
  • USED Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M, EDEMO15, Used, Condition Fair , MPN: 001-SD MAG-AD9-GLOCK-9AND40-M-EDEMO15 , Code: 3JS-CNC-SDMA9-001-SD-9AND40-M-0RD-EDEMO15
  • DEMO, Stern Defense MAG-AD9 AR-15/M4/M16 Magazine Conversion Adapter, Glock, 9mm/.40S&W, Black, 001-SD MAG-AD9-9AND40-M , MPN: 001-SD MAG-AD9-GLOCK-9AND40-M-DEMO , Code: 3JS-CNC-SDMA9-001-SD-9AND40-M-DEMO
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