ProMag DRMA105 40rd Drum Magazine – .45 ACP Black Polymer

The ProMag DRMA105 is a 40-round drum magazine designed for the Auto-Ordnance Thompson .45 ACP Carbine. The drum housing is molded from a DuPont Zytel-based polymer and uses an injection-molded follower and a heat-treated stainless steel magazine spring. The design prioritizes reliable feeding for compatible Thompson carbine platforms and is manufactured in the United States.

Key Specifications

• The magazine holds 40 rounds.
• Designed for .45 ACP cartridges.
• Compatibility is specified for the Auto-Ordnance Thompson .45 ACP Carbine.
• The drum housing is constructed of a proprietary DuPont Zytel-based polymer.
• The follower is an injection-molded magazine follower.
• The magazine spring is formed from heat-treated stainless steel.
• The exterior finish is black polymer.
• Model designation is DRMA105.
• Manufactured in the USA.

With its high-capacity layout and durable polymer construction, the DRMA105 provides an option for users who need extended capacity on compatible Thompson carbine platforms. The combination of a robust polymer drum, reliable stainless steel spring, and straightforward design makes it suitable for range use and historical-platform applications where higher capacity is desired.