A favorite among budget-minded and personal defense shooters across the country, the KCI(R) 9mm 17-Round Magazine for Glock(R) 17 Pistols is an affordable aftermarket pistol magazine featuring a durable, high-impact polymer body with a hardened steel lining for lasting performance and factory-like field performance you can depend on. Numbered witness holes offer quick, at-a-glance round counts for improved reliability while on the move. Plus, the strong steel spring and anti-tilt polymer follower work together to deliver consistent cartridge alignment and jam-free feeding in any environment. If that's not enough, this magazine comes equipped with precision-molded, steel-reinforced feed lips for a snug, wobble-free fit and improved functionality in high-stress environments. Pick up an extra Glock-compatible aftermarket magazine or two today and enjoy consistent field service at an affordable price. Order yours today! Durable, steel-lined polymer body Numbered witness holes Precision engineered feed lips Non-tilt polymer follower