ProMag HECA17 40-Round 9mm Magazine H&K MP5/PTR9 Black Polymer

The ProMag HECA17 delivers extended capacity for H&K MP5 and PTR9 platforms with a robust 40-round design. This high-capacity magazine addresses the need for sustained fire capability in training scenarios and competitive shooting applications.

What Makes This Different

Unlike standard 30-round magazines, the HECA17 provides 33% more ammunition capacity while maintaining reliable feeding characteristics. The extended body design incorporates reinforced polymer construction that withstands repeated loading cycles. ProMag engineers this magazine to function across multiple MP5 variants and PTR9 rifles without modification.

Key Features

• 40-round capacity extends shooting sessions and reduces reload frequency
• Black polymer construction resists impact damage and environmental wear
• Compatible with H&K MP5, MP5K, and PTR9 rifle platforms
• Anti-tilt follower design prevents feeding malfunctions during rapid fire
• Heat-treated spring maintains consistent tension through extended use
• Textured grip panels provide secure handling during tactical reloads
• Drop-free design enables fast magazine changes under stress

Range testing demonstrates consistent feeding with various 9mm ammunition weights from 115 to 147 grains. The magazine functions reliably in competitive shooting environments where high round counts are standard. Law enforcement training facilities utilize these magazines for sustained fire drills and qualification courses. The polymer construction maintains dimensional stability across temperature ranges from -20°F to 140°F.

Technical Specs

• Capacity: 40 rounds of 9mm Luger ammunition
• Material: Impact-resistant black polymer body
• Compatibility: H&K MP5, MP5K, PTR9 rifles
• Overall Length: Approximately 8.5 inches
• Weight: 4.2 ounces empty
• Spring: Heat-treated steel with anti-fatigue coating
• Follower: Anti-tilt polymer design
• Country of Origin: United States

Professional shooters and training instructors choose the HECA17 when standard capacity magazines limit performance potential. The combination of proven reliability and extended capacity makes this magazine essential for serious MP5 and PTR9 users who demand consistent function.