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FN mid mag master: 20100348 – 509 15rd 9mm Luger FN 509 Midsize Black Stainless Steel featuring UPC 845737010126. FN America. 20100348 – Grip gain.
Mag midsize: FN factory 9mm 15 round magazine for FN 509 Midsize pistols black polymer body stainless steel spring anti-friction coating anti-tilt follower basepad witness windows textured front low profile extended length flush fit reliable feeding double stack high strength polymer impact corrosion resistant – spare essential competition duty concealed carry smooth operation last round slide lock.