The iconic drum magazine is as much a part of the classic submachine gun silhouette as the receiver itself. For collectors, range competitors, and defensive-minded shooters, a properly built drum delivers both historical authenticity and extended on-target time between reloads.

THOMPSON SMG is offered with authentic, U.S.-manufactured drum magazines built to original specifications, bringing that recognizable profile and function back to modern platforms.

What makes these drum magazines distinctive

These drums are manufactured in the United States to the exact specifications of the originals. The attention to authentic dimensions and materials is what separates a display piece from a functional, serviceable magazine. Available capacities include 10, 50, and the large 100-round drum—the 10- and 50-round drums share a 6.75″ diameter while the 100-round drum measures 8.75″ in diameter. Each unit ships with a drum installation device (a “3rd hand”) and a Thompson manual to guide proper use and care. View product details and pricing

Drum dimensions and handling

The specified diameters translate directly to how the drum affects handling and balance. The larger 8.75″ 100-round drum will significantly change the center of gravity and adds bulk, so plan for altered ergonomics and carry options. The smaller 6.75″ drums are easier to manage and still deliver meaningful capacity without the same penalty in bulk.

Installation, compatibility, and accessories

Each drum ships with a drum installation device that acts as a helper during loading and seating—valuable for safe, repeatable installation. The drums are built to fit most full-auto models, and because they’re made to original specs they’re the best option when matching historical fit and function. Brand pedigree also matters: Auto-Ordnance’s connection to the design and the fact that models are listed as Various reflect a range of compatible Thompson-pattern platforms.

Practical considerations for defensive use

At a price of $326.99, these drums are an investment in authenticity and prolonged fire capacity. For tactical applications consider training to manage weight, reload transitions, and safe handling of high-capacity magazines. The included manual and installation device make initial setup straightforward; ongoing maintenance will preserve feed reliability and extend service life.

For collectors and operational users seeking historically accurate, U.S.-made drum magazines for the THOMPSON SMG, these units offer a balance of appearance and function. Check current availability

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