PMAG® 30 AR 300 B GEN M3™ by Magpul

Product Overview

Engineered specifically for .300 AAC Blackout platforms, the PMAG® 30 AR 300 B GEN M3™ is a purpose-built, 30-round polymer magazine designed to deliver consistent feeding, enhanced durability, and clear caliber differentiation. Unlike standard 5.56 NATO magazines, this dedicated .300 BLK magazine features optimized internal geometry to reliably feed a wide range of bullet weights and profiles, from lightweight supersonic to heavy subsonic loads. Built on the proven GEN M3 architecture, it offers superior strength, handling, and long-term performance for tactical, defensive, and range applications.

Key Features & Benefits

Purpose-Built .300 AAC Blackout Design
• Dedicated internal rib geometry optimized for .300 BLK cartridge dimensions
• Reliable feeding across diverse bullet shapes and grain weights
• Reduces risk of cross-loading compared to standard 5.56 magazines

Distinct Caliber Identification
• Unique external rib pattern and upper-body texture for visual and tactile differentiation
• Paint pen dot matrix on floorplate for easy marking and load identification

GEN M3 Enhanced Durability
• Advanced impact- and crush-resistant polymer construction
• Reinforced body and feed lip design for long service life
• Aggressive front and rear texturing for improved grip in adverse conditions
• Slim, removable floorplate for easy maintenance and cleaning

Broad Platform Compatibility
• Designed for AR-15, M4, and M16 pattern rifles chambered in .300 AAC Blackout
• Compatible with most STANAG 4179-compliant platforms
• Works with many PMAG accessories and identification plates

Detailed Specifications

Caliber: .300 AAC Blackout
Capacity: 30 rounds
Platform Compatibility: AR-15 / M4 / M16 pattern rifles (.300 BLK only)
Material: Proprietary impact- and crush-resistant polymer
Finish: Textured polymer body
Floorplate: Removable slim profile
Weight: Approximately 5 oz
Overall Length: Approximately 7.5 inches
Country of Manufacture: USA