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This is the drum magazine every Thompson owner thinks about. The Auto-Ordnance 100-round drum is built to the exact specifications of the originals, giving you that unmistakable profile and the extended capacity that makes a Thompson feel complete. It feeds .45 ACP reliably through a rotary design with a high-strength steel spring and polymer follower, so you're not just getting looks—you're getting a magazine that will keep running through extended shooting sessions.
You get blued steel construction that matches the period-correct look while providing actual corrosion resistance. The 8.75-inch diameter is classic Thompson, and at about 3.7 pounds loaded, it definitely adds some weight to the gun—which is why the vertical foregrip becomes almost essential for handling. The entire drum ships from Worcester, MA manufacturing, which means it's built to the same tolerances that made original drums function in both semi-auto and full-auto platforms.
Each drum comes with the third-hand installation device (sometimes called the "helping hand"), which is honestly the only way to properly load and tension this thing. Using the tool ensures you're not over-winding the spring or creating binding issues that cause failures later. Follow the instructions carefully, and you'll get smooth, consistent feeding from round one through round one hundred.
This drum is designed for the 1927-A1 Thompson models and modern rifles made in Worcester, MA or Greeley, PA. It will not fit Thompson M1 models (if your gun has a side charging handle, it's an M1). It also won't work with West Hurley production runs or guns made before 1990. If your Thompson is a newer civilian model or a modern semi-auto variant, check your paperwork or the manufacturer—compatibility matters here.
It's built for Thompson 1927-A1 models and modern semi-auto rifles made in Worcester, MA or Greeley, PA. If your gun is an M1 model (has a side charging handle) or was made in West Hurley or before 1990, this won't work. Check your rifle's markings or the manufacturer before ordering.
The third-hand installation device that comes with the drum is essential—it properly tensions the spring without over-winding, which prevents jams and binding issues. Follow the manufacturer's instructions carefully, as proper technique is the difference between smooth operation and problems. Never wind it backwards, as this can damage internal components.
This is manufactured by Auto-Ordnance to the original specifications and built in the USA. It's not a military surplus drum but a new factory-produced magazine designed to match the originals. It'll work reliably in both semi-auto and most full-auto Thompson models.
The 100-round drum holds five times the capacity of a 20-round stick magazine, letting you focus on shooting instead of reloading at the range. The trade-off is weight—a loaded 100-round drum is about 3.7 pounds, which is why most people run a vertical foregrip with it. For extended range sessions, it's the classic choice.
| UPC | 602686211123 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | QTMT14KT |
| Brand Fit | Thompson |
| Caliber/Gauge | .45 ACP |
| Capacity | 100 |
| Color | BLUED |
| Length | 11 |
| Model | |
| Model Fit | Thompson |
| Package Height | 4.0 |
| Package Width | 11.0 |
| Product Type | Accessory-Magazines |
| Quantity | 1 |
| Shipping Weight | 3.7 |
| State Restriction (CA) | NO DIRECT SHIP TO CALIFORNIA |
| State Restriction (IL) | NO SALE TO ILLINOIS PICA |
| State Restriction (RI) | NO DIRECT SHIP TO RHODE ISLAND |
| State Restriction (WA) | NO DIRECT SHIP TO WASHINGTON |
| Style | Drum |
| Units per Box | 1 |
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