Factory FN OEM 10-round magazine for the most restrictive state capacity limits.

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FN America FN PS90 Rifle Magazine 5.7x28mm 10 Round Translucent Black 1 Pack Polymer
The FN PS90 10-round magazine exists for one reason: residents of states with a hard 10-round capacity limit (most restrictive in California, New York, New Jersey at certain configurations) need a compliant feeder for their PS90. FN OEM build quality, translucent polymer, same feed geometry as the 50-rounder, but capped at 10.
Unrestricted shooters should ignore this listing entirely. The PS90 was designed around 50-round capacity, and a 10-round magazine in this platform is purely a legal compliance product.
Add the FN PS90 10-Round Compliant Magazine to your build and see how it enhances your platform.