MAGAZINE EXTENSION FOR SPRINGFIELD ARMORY ECHELON The Tyrant CNC Magazine Extension, or also known as base pads, are expertly designed to increase the ammunition capacity of Springfield Armory Echelon's 15 and 17-round magazines by an additional 5 rounds of 9mm. This enhancement is crucial for users seeking increased capacity without compromising the firearm's reliability and performance. Precision Engineering and Materials: Each Springfield Armory Echelon magazine extension is CNC machined from T6061 aerospace-grade aluminum, a material chosen for its optimal balance of strength and lightweight properties. This level of precision in machining ensures a perfect fit a Mfg: Tyrant Cnc