The Shield Arms SA-S15-BLKN-GEN3 is a ground-breaking, flush-fitting 15 round magazine, specifically designed for Glock 43X and Glock 48. Identical in length to the OEM Glock 10 round magazine, the steel-constructed S15 stands out by providing an additional 5 rounds.So, what sets the Gen 3 version apart? We\'ve implemented a series of enhancements that include being produced by a US-based manufacturer and utilizing modular tooling. Raised ribs featured on the back of the magazine perfect align with the OEM magazine position in the mag well, effectively eliminating any tolerance stacking brought on by Glock frame variations.Apart from this, we\'ve introduced new steel, a fresh coating, and a revamped heat treat process into the equation. The new steel is slightly thicker, stronger, and now boasts a standard black nitrocarburized QPQ finish. This guarantees a robust degree of corrosion resistance, ensuring your magazine stands the test of time.