The ATI Schmeisser S50 MLE is a high-capacity magazine extension designed for Glock 17 and 19 magazines. Debuted at SHOT Show 2026, it moves away from the traditional "long stick" or bulky drum designs in favor of a quad-stack (casket) configuration.
The S50 MLE is an adapter kit that replaces the floorplate of your existing OEM Glock magazine. It utilizes a patented German-engineered system to arrange rounds into four vertical rows, allowing for massive capacity without the excessive length of a 50-round stick mag.
Technical Specifications
Capacity:
- Glock 17 Body: Increases total capacity to 50 rounds.
- Glock 19 Body: Increases total capacity to 48 rounds.
Construction:
- High-strength, glass-reinforced polymer.
System:
- Patented 4-row (quad-stack) "Casket" design.
Compatibility:
- Glock 17, 19, 19X, 26, 34, and 45 (Gen 3, 4, and 5).
Mechanism: Dual-spring high-tension system with a low-friction anti-tilt follower.
Key Features:
- Compact High Capacity: Offers 50 rounds in a profile only slightly longer than a standard 33-round "happy stick," making it easier to maneuver and stow in pouches.
- Toolless Installation: The extension can be mounted without a gunsmith. It includes a specialized disassembly tool for easy removal, and the modification is entirely reversible.
- Full-Auto Rated: Extensively tested for reliability in high-rate-of-fire platforms and suppressed weapons (PCCs like the Banshee or AR-9).
- Visual Indicators: Features side windows to allow for quick round-count checks.
- Included Loader: Because of the heavy spring tension required for 50 rounds, the kit typically ships with a dedicated magazine loader
