Rock Island ACT-MAG 17rd 9mm Magazine for S&W M&P - Blued Steel

The Rock Island ACT-MAG 17-round magazine delivers extended capacity for Smith & Wesson M&P pistols without compromising reliability. This aftermarket magazine provides shooters with additional rounds over standard capacity options while maintaining the proven feed geometry that M&P pistols demand.

What Makes This Different

Unlike polymer alternatives, the ACT-MAG features all-steel construction with a blued finish that resists corrosion and wear. The magazine body uses heat-treated steel walls that won't crack under pressure, while the internal spring system maintains consistent tension through thousands of loading cycles. Factory dimensional specifications ensure proper lockup and feeding in all M&P variants chambered in 9mm Luger.

Key Features

• 17-round capacity extends standard magazine count by 2-3 rounds
• Heat-treated steel body construction prevents cracking and deformation
• Blued finish provides corrosion resistance in humid conditions
• Drop-free design ensures reliable ejection during tactical reloads
• Compatible with all Smith & Wesson M&P 9mm pistol variants
• Witness holes allow visual round count verification
• Anti-tilt follower design prevents feeding malfunctions

Competitive shooters and law enforcement officers rely on extended capacity magazines for stages requiring high round counts. The ACT-MAG's steel construction handles repeated drops and impacts better than polymer magazines, making it suitable for duty use where equipment durability matters. The magazine feeds hollow point and ball ammunition equally well, maintaining consistent performance across different bullet profiles.

Technical Specs

• Capacity: 17 rounds of 9mm Luger
• Construction: Heat-treated steel body with blued finish
• Compatibility: Smith & Wesson M&P pistols in 9mm
• Follower: Anti-tilt polymer design
• Spring: High-tensile steel with consistent compression rating
• Base plate: Steel with textured grip surface
• Overall length: Approximately 5.2 inches

The Rock Island ACT-MAG represents solid value for shooters requiring additional capacity without premium pricing. Steel construction and proven feed geometry make this magazine a practical choice for both range training and serious applications where reliability cannot be compromised.