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When you own an Auto-Ordnance Thompson 1911 in 9mm, sticking with the factory magazine just makes sense. This is the G57S — the genuine OEM replacement mag from Auto-Ordnance, purpose-built for their full-size 1911 platform. No guessing on fitment, no break-in drama, no compatibility concerns. It drops in and works the way the pistol was designed to work.
The magazine body is stainless steel throughout, which gives it a leg up on longevity compared to blued alternatives. Stainless handles sweat, humidity, and the occasional pocket carry situation a lot better over time. The baseplate is fixed and non-removable by design, which keeps the overall construction tight and eliminates one more potential failure point.
Capacity is 9 rounds of 9mm Luger, which is right in line with what a standard full-size 1911 frame can accommodate in 9mm. Whether you are picking up a spare to keep on hand at the range or replacing a worn magazine, this is the factory-correct option to reach for.
Auto-Ordnance has been producing 1911 pistols and accessories under the Kahr Firearms Group umbrella, and the quality control on their current production magazines reflects that. If you have a Thompson 1911 9mm that has been running well on its factory mag, this is the right choice to keep that reliability going.
This magazine is designed and spec'd specifically for Auto-Ordnance Thompson 1911 full-size pistols chambered in 9mm. While the 1911 platform is fairly standardized, individual guns can vary in timing and tolerances, so using the OEM factory magazine is always the safest way to ensure reliable feeding and function in your specific pistol.
Standard 1911 magazines are built for .45 ACP and typically hold 7 rounds. Because 9mm cartridges are slimmer in diameter, a 1911-pattern mag designed for 9mm can fit 9 rounds in the same overall length. The pistol uses a standard 1911 frame, so the magazine still fits and functions within that footprint.
Stainless steel holds up much better to moisture, sweat, and humidity over time. Blued magazines can show surface rust if the finish gets worn or scratched, while stainless is far more forgiving in that regard. For a magazine that sees regular handling and range use, the stainless finish offers better long-term durability with less maintenance required.
A fixed or non-removable baseplate is welded onto the magazine body rather than being held by a removable floorplate. This makes the magazine more structurally rigid and eliminates the possibility of the baseplate coming loose during a drop or under hard use. The trade-off is that disassembly for deep cleaning is not possible, but for most range and duty use it is a non-issue.
Yes, this is the factory OEM magazine from Auto-Ordnance for their 9mm Thompson 1911 full-size pistol. It carries the same MPN (G57S) that corresponds to the stainless version included or sold alongside those pistols. If you are looking for a true drop-in replacement or a backup mag, this is the correct part.
| UPC | 602686320122 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | G57S |
| Caliber/Gauge | 9mm |
| Capacity | 9 |
| Length | 6 |
| Model | |
| Package Height | 0.7 |
| Package Width | 3.1 |
| Product Type | Accessory-Magazines |
| Shipping Weight | 0.15 |
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