The ATI Extended 33-Round 9mm GSG-9 Magazine is a high-capacity "stick" magazine specifically marketed for use with the American Tactical (ATI) GSG-9 (a modern 9mm pistol/PCC based on the MP-9 design).
While it is often branded as the "GSG-9 Mag," it is effectively a Glock-pattern magazine.
Key Performance Details
- Design: It follows the standard double-stack 9mm Glock geometry.
- Materials: Built with a high-impact polymer body and a heavy-duty spring. Note that unlike OEM Glock mags, many aftermarket ATI/GSG magazines may lack the full internal steel lining, making them lighter but slightly less rigid under extreme heat or pressure.
- The "GSG-9" Factor: The ATI GSG-9 firearm comes with interchangeable mag-well adapters for both Glock and Sig P320 magazines. This 33-round mag is the "Glock-style" version included with the gun.
Compatibility & Use
| Application | Compatibility |
| Glock Pistols | Fits all double-stack 9mm models (G17, G19, G19X, G26, G34, G45). It will protrude significantly from the grip. |
| PCCs / AR-9s | Compatible with most Glock-mag-fed platforms (Ruger PC Carbine, EPC-9, PSA AR-V, etc.). |
| GSG-9 Pistol | This is the factory-spec extended mag for the GSG-9 when using the Glock adapter. |
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