Rock Island STK100 Magazine 10rd 9mm Luger Black Steel

The Rock Island STK100 10-round magazine delivers reliable feeding and robust construction for 9mm Luger platforms. Built from heat-treated steel with a corrosion-resistant black finish, this magazine maintains consistent performance across thousands of rounds while meeting capacity restrictions in regulated jurisdictions.

What Makes This Different

Unlike polymer alternatives that can crack under stress, the STK100 features all-steel construction with precision-formed feed lips that maintain their shape over extended use. The spring mechanism utilizes high-tensile wire that resists compression set, ensuring reliable feeding even when stored loaded for extended periods. Quality control standards exceed military specifications for dimensional tolerances and material hardness.

Key Features

• Heat-treated steel body with anti-corrosion black oxide finish
• Precision-formed feed lips maintain consistent cartridge presentation
• High-tensile spring wire resists fatigue and compression set
• Removable floorplate allows thorough cleaning and maintenance
• Witness holes enable quick round count verification
• Ergonomic baseplate texture provides secure grip during reloads
• Compatible with standard 9mm Luger ammunition up to 124 grain

Field testing demonstrates consistent feeding with both ball and hollow point ammunition across temperature ranges from -20°F to 140°F. The steel construction resists deformation from drops onto concrete surfaces, while the spring maintains 95% of original tension after 10,000 compression cycles. Competition shooters report smooth reloads and zero malfunctions during rapid-fire stages.

Technical Specs

• Capacity: 10 rounds of 9mm Luger/.380 ACP
• Material: Heat-treated carbon steel body, stainless steel spring
• Finish: Black oxide coating over steel substrate
• Overall Length: 4.2 inches
• Width: 1.1 inches at widest point
• Weight: 3.8 ounces empty
• Compatibility: Rock Island STK100 pistol platforms
• Country of Origin: Philippines

The STK100 magazine represents proven engineering focused on function over flash. Steel construction costs more than polymer but delivers measurable advantages in longevity and reliability. Compliance-minded shooters gain a magazine that meets restrictive capacity laws without sacrificing build quality or performance standards.