Ultra-Reliable, Extra-Capacity & Smooth Feeding Of All The Rounds - Wilson Combat applied 30 years of experience building high-performance 1911 magazines to develop this ultra-reliable magazine for combat, competition, or self-defense. Made with state-of-the-art materials using the latest manufacturing technology, these single-stack magazines are built tough to keep running in unforgiving, real-world conditions. The body formed from extra-thick stainless steel, with the radius of each curve engineered to minimize stress points, virtually eliminates feed lip cracking and stress fatigue. Even the position of the witness slots toward the rear is designed to enhance structural integrity. A proprietary welding, deburring, and polishing process provides an unusually strong, super-smooth seam to ensure snag-free follower movement and easy insertion in the mag well. The non-tilt follower of self-lubricating polymer fully supports the ammo stack to prevent nose-dives, double feeds, and other hang-ups. The mag body design puts less tension on the spring than standard magazines, increasing spring life and making it easy to seat a fully loaded magazine with the slide closed. Numbers 1 through 10 stamped on the bottom help you mark each of your magazines to track usage and performance.