Mec-Gar Magazine for Glock 17 Features The Mec-Gar Magazine with Extension is built from heat treated carbon steel for strength and long-term reliability under repeated loading and firing cycles. An anti-friction coating on the magazine body reduces drag on the follower helping rounds feed smoothly even when the magazine is loaded to its full 20-round capacity. The high visibility green high-impact polymer follower makes it easy to see remaining ammunition at a glance during a reload. A high tensile music wire spring provides consistent long-lasting spring pressure cycle after cycle. This magazine extends the Glock 17 s standard capacity to 20 rounds of 9mm giving shooters additional rounds on tap for range sessions competition or home defense use. A black polymer floorplate caps off the magazine and gives it a finished durable base that resists impact from drops. No magazine catch replacement is needed to run this magazine simplifying the upgrade for existing Glock 17 owners. Manufactured in Italy using Mec-Gar s sophisticated tooling and quality control this magazine reflects six decades of experience supplying magazines to major firearm manufacturers and military forces around the world. Mec-Gar Magazine for Glock 17 Specifications Manufacturer: Mec-Gar Model: Magazine with Extension Caliber: 9mm Capacity: 20 Rounds Compatible Hosts: Glock 17 Color: Black Material: Carbon Steel Finish: Anti-Friction Coating Style: Extended Available At: GrabAGun