Smith & Wesson SW99 Compact 9mm 10-Round Magazine w/ finger rest

This is a Factory SW99 COMPACT 9MM 10RD magazine with extension.
Constructed of durable, yet lightweight stainless steel with a corrosion-resistant finish, this magazine offers lasting performance in virtually any environment. The injection-molded polymer follower and steel wire spring deliver smooth, dependable operation, while machined witness holes allow for quick, visual round counts. Plus, the polymer floor plate offers superior bump and abrasion resistance.