Glock 31 Gen3 .357 SIG 15-Round Magazine - Black Polymer

The Glock MF31015 magazine delivers reliable feeding and consistent performance for Glock 31 pistols chambered in .357 SIG. This factory magazine maintains the same construction standards and materials as magazines shipped with new firearms. Built to withstand thousands of loading cycles while maintaining spring tension and follower alignment.

What Makes This Different

Factory Glock magazines feature precision-molded polymer bodies with steel reinforcement inserts at stress points. The magazine spring uses heat-treated steel wire wound to exact specifications for consistent feeding pressure. Unlike aftermarket alternatives, these magazines undergo the same quality control testing as original equipment, ensuring dimensional accuracy within 0.001 inches.

Key Features

• 15-round capacity for .357 SIG cartridges with reliable feeding geometry
• Black polymer construction with steel reinforcement inserts at wear points
• Orange follower with anti-tilt design prevents jamming and misfeeds
• Dual-purpose magazine catch cuts work with ambidextrous controls
• Drop-free design allows rapid magazine changes under stress
• Compatible with Glock 31 and 32 pistols in .357 SIG caliber
• Witness holes numbered 5, 10, and 15 for quick round counting

The magazine body withstands temperature extremes from -40°F to 200°F without cracking or dimensional changes. The steel spring maintains tension through 10,000+ compression cycles. Law enforcement agencies and competitive shooters rely on these magazines for duty carry and match use. The polymer construction resists impact damage while remaining lightweight at 2.8 ounces empty.

Technical Specs

• Capacity: 15 rounds of .357 SIG ammunition
• Overall Length: 5.43 inches
• Width: 1.18 inches
• Weight: 2.8 ounces empty
• Material: Glass-filled nylon polymer with steel inserts
• Follower: Orange polymer with anti-tilt design
• Spring: Heat-treated music wire steel
• Compatibility: Glock 31, 32 pistols
• Country of Origin: Austria

Factory magazines eliminate compatibility issues and feeding problems associated with aftermarket alternatives. The precise tolerances ensure consistent lockback function and reliable ejection. Professional users choose OEM magazines to maintain the same reliability standards as their primary firearm.