ProMag DRMA37 40-Round Drum Magazine .45 ACP Glock 21/30

The ProMag DRMA37 transforms standard Glock .45 ACP pistols into high-capacity platforms with its 40-round drum configuration. This magazine extends shooting sessions while maintaining reliable feeding through ProMag's proven drum mechanism design.

What Makes This Different

Unlike standard 13-round Glock magazines, this drum configuration nearly triples capacity without requiring multiple reloads. The DuPont Zytel polymer construction provides chemical resistance and dimensional stability across temperature ranges. The spring-loaded follower system ensures consistent ammunition positioning throughout the entire 40-round capacity.

Key Features

• 40-round capacity increases shooting time and reduces reload frequency
• DuPont Zytel polymer construction resists impact and chemical exposure
• Compatible with Glock 21 and Glock 30 pistol frames
• Spring-loaded follower maintains ammunition alignment during feeding
• Drum configuration distributes weight for balanced handling
• Loading window allows visual ammunition count verification
• Textured grip surfaces prevent slippage during magazine changes

Range sessions benefit from extended capacity during training drills and competitive shooting scenarios. The drum mechanism feeds various .45 ACP bullet weights and profiles consistently. Temperature variations from -20°F to 180°F don't affect the polymer housing or internal spring tension. Competition shooters appreciate the reduced reload frequency during rapid-fire stages.

Technical Specs

• Capacity: 40 rounds of .45 ACP ammunition
• Compatibility: Glock 21, Glock 30 pistol frames
• Material: DuPont Zytel polymer construction
• Color: Black polymer finish
• Configuration: Drum-style magazine design
• Follower: Spring-loaded polymer follower
• Manufacturer: ProMag Industries
• Model: DRMA37

This drum magazine addresses capacity limitations inherent in standard pistol magazines. ProMag's manufacturing standards ensure dimensional consistency for reliable function across different Glock .45 ACP platforms.