Stainless steel body Corrosion-resistant black finish Durable polymer extension sleeves (Compact, Midsize, Standard) Removable floor plate Steel wire internal spring Anti-tilt polymer follower Combining maximum capacity with an enhanced grip area, the FNA(R) 509(TM) 24-Round Magazine Kit is an extended factory OEM magazine, engineered to deliver improved ergonomics and enhanced control in fast-action environments. Compatible with all FN 509 pistol models, this magazine features heat-treated stainless steel construction with a black finish for superior durability and corrosion resistance in any environment. The steel wire internal spring and anti-tilt polymer follower ensure flawless feeding, while numbered witness holes allow for quick, visual round counts in the field. Three polymer extension sleeves (compact, midsize, standard) integrate with your pistol's frame for snag-free carry, while the removable floor plate allows for quick disassembly for maintenance and cleaning. Better yet, this magazine is precision-engineered for a snug, wobble-free fit for added reliability.