Korean-made aftermarket 50-round PS90 magazine at roughly half the price of factory FN.
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KCI USA produces aftermarket P90 magazines at well under the price of factory FN. At roughly $25 versus $43, KCI is the obvious choice for shooters building out a range bag. Reliability is good but not factory-equivalent: expect occasional feed hiccups on early production runs, and inspect feed lips for cracking after extended round counts.
The right framing for KCI mags is range stockpile, not duty rotation. If you intend to shoot the PS90 hard at the range and want eight or ten loaded magazines staged for a high-volume session, KCI gets you there for well under the factory outlay. For defensive carry or instructional roles where a feed failure is unacceptable, stay with factory FN.
KCI mags use the same external geometry as the FN factory mag and lock into all PS90 and P90 variants without modification.
Add the KCI USA P90 50-Round Magazine to your build and see how it enhances your platform.