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This is an ATI PS90 or AR57 50rd. Magazine. This magazine was manufactured by KCI in Korea for American Tactical Imports. This magazine looks and feels like an original FN magazine. This magazine will function Flawlessly with ballistic tip SS197 ammo. It may not function Flawlessly with hollow point ss192 or ss195lf. There has been some reports that the magazine will jam occasionally with hollow points. These are quality mags and will work with the PS90 and the AR57.