While the Stern Defense Mag-AD Series of Ejectors are durably build, ejectors are one of those components that can break after long periods of use. Having a spare on-hand to keep your gun running is a smart idea, and this Mag-AD Series Ejector Replacement Kit is an OEM replacement for your gun's Mag-AD ejector. The unit is made from heat-treated 1050 spring steel, and the electroless-Nickel-coating will provide you with an extended service life and protection against corrosion.