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Questions & Answers
Will this work with 1911 magazines? Manufacturer Answer

It will not.

by STERN DEFENSE, Manufacturer, May 31, 2023
Will this accept 45 acp glock magazines? Cannot find a magwell adapter specifically for 45 mags Expert Answer

Unfortunately, we do not currently carry a magazine adapter that is compatible with .45ACP Glock magazines.

by Ethan, Gear Expert, August 19, 2022
Customer Reviews
Helpful Positive Review Foxtrot Mike integration by Tk, October 9, 2024
It works perfectly well with a foxtrot mike 45acp BCG as long as you modify the bolt by shaving off a little bit from the underside at the front so it doesn’t slam into the ramp and also clean up the extractor pin. I have now shot around 150 rounds w...
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1/1 found this helpful
Helpful Positive Review Great Mag-Ad by Nathan, Verified Owner, August 25, 2020
Purchased this a year ago, had all sorts of problem with feeding. Contacted Stern, they pointed me in the right direction. If you go this route, you HAVE to use the Stern bolt and 11oz buffer. Believe me, don’t use anything else. I was using A Foxtro...
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5/5 found this helpful
Helpful Positive Review slideforadaptor by slade, March 19, 2019
looked at all of them. glad Spent the extra bucks as it is worth it! do yourself a favor and get this one. not only works but looks great what more is there to say? don't cheap out and end up disappointed.
3/3 found this helpful
Helpful Negative Review Not high capacity by William, January 29, 2023
Only uses M&P 45 magazines, 13 rounds maximum. Mags are $50. I should have bought the dedicated receiver for $130.the magazine release is awkward. However there are limited options if you want to shoot 45 on this platform.
1/1 found this helpful
Most Recent Reviews Great mag adapter by Lowrider6618, Verified Owner, June 21, 2025
This mag adapter was easy to install on my AR 15 lower.
Most Recent Reviews 45 mag. Conversion by Cutter, Verified Owner, March 2, 2025
Good quality made product would recommend to anyone that has been looking for one
Read All 11 Reviews
Color: Black Gun Model: AR-15 , M4 , M16 Magazine Capacity: 0 RoundAdditional Features: 4140 NiB coated feed ramp , Constructed from 6061 T6 aircraft grade aluminum. , Ergonomic mag release. , Hard coat anodized type 3. , Sturdy Construction. , Uses Smith & Wesson M&P Magazines , Works with all generations of M&P magazines. , Works with any mil spec ar15 lower receiver. Condition: New

Code: 3JS-CNC-SDADM-AD-MP-45ACP-M-0RD

MPN: 001-SD MAG-AD-MP-45ACP-M

UPC: 850001176040

List: $240.41Save 22%
$186.99

Product Info for Stern Defense MAG-ADMP45 AR-15 M&P .45 ACP Magazine Conversion Adapter

THIS MUST BE USED WITH A 11 OUNCE BUFFER OR HEAVIER WHEN USING A CARBINE SPRING. CLICK HERE FOR BUFFERimage

45ACP UPPERS MUST HAVE AN ENLARGED EJECTION PORT.

Convert your standard mil spec AR 15, M4, M16 lower assembly to use 45ACP M&P 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-AD series adapters are made of aircraft grade aluminum, lightweight with ergonomic design.

Note: These adapters require the use of a 45ACP barrel, and a Glock cut bolt.

Technical Information:

made in specialized factories

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 M&P magazines.

Works with any mil spec ar15 lower receiver.

Specifications for Stern Defense MAG-ADMP45 AR-15 M&P .45 ACP Magazine Conversion Adapter:

Manufacturer: Stern Defense
Color: Black
Gun Model: M16, M4, AR-15
Magazine Capacity: 0 Round
Additional Features: Uses Smith & Wesson M&P Magazines, Works with all generations of M&P magazines., Works with any mil spec ar15 lower receiver., Ergonomic mag release., Sturdy Construction., Hard coat anodized type 3., 4140 NiB coated feed ramp, Constructed from 6061 T6 aircraft grade aluminum.
Condition: New
Caliber: .45 ACP
Magazine Included: No

Package Contents:

  • Stern Defense MAG-ADMP45 AR-15 M&P .45 ACP Magazine Conversion Adapter

Stern Defense MAG-ADMP45 AR-15 M&P .45 ACP Magazine Conversion Adapter Orderable Models

List of Orderable Models

Stern Defense MAG-ADMP45 AR-15/M4/M16 Magazine Conversion Adapter, M&P, .45 ACP, Black, 001-SD MAG-AD-MP-45ACP-M , MPN: 001-SD MAG-AD-MP-45ACP-M , UPC: 850001176040 , Code: 3JS-CNC-SDADM-AD-MP-45ACP-M-0RD

Stern Defense MAG-ADMP45 AR-15 M&P .45 ACP Magazine Conversion Adapter Unavailable & Discontinued Models

List of Unorderable Models

USED Stern Defense MAG-ADMP45 AR-15/M4/M16 Magazine Conversion Adapter, M&P, .45 ACP, Black, 001-SD MAG-AD-MP-45ACP-M, EDEMO4, Condition Fair, Other , MPN: 001-SD MAG-AD-MP-45ACP-M-EDEMO4 , Code: 3JS-CNC-SDADM-AD-MP-45ACP-M-0RD-EDEMO-OT-D
DEMO, Stern Defense MAG-ADMP45 AR-15/M4/M16 Magazine Conversion Adapter, M&P, .45 ACP, Black, 001-SD MAG-AD-MP-45ACP-M , MPN: 001-SD MAG-AD-MP-45ACP-M-DEMO , Code: 3JS-CNC-SDADM-AD-MP-45ACP-M-DEMO-000RD
DEMO, Stern Defense MAG-ADMP45 AR-15/M4/M16 Magazine Conversion Adapter, M&P, .45 ACP, Black, 001-SD MAG-AD-MP-45ACP-M , MPN: 001-SD MAG-AD-MP-45ACP-M-DEMO , Code: 3JS-CNC-SDADM-AD-MP-45ACP-M-DEMO-0RD
DEMO, Stern Defense MAG-ADMP45 AR-15/M4/M16 Magazine Conversion Adapter, M&P, .45 ACP, Black, 001-SD MAG-AD-MP-45ACP-M , MPN: 001-SD MAG-AD-MP-45ACP-M-DEMO , Code: 3JS-CNC-SDADM-AD-MP-45ACP-M-DEMO-00RD
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