FN PS90 50-Round Magazine

The FN PS90 50-round magazine is the gun. The PS90 and P90 were engineered around this top-loading horizontal magazine, and stocking up on factory OEM 50-rounders is the first purchase every PS90 owner should make. Two factory mags ship with the rifle in most configurations; four to six on hand is the realistic minimum to feed a range trip without spending half the day reloading.

The translucent polymer body lets the shooter see round count at a glance, which matters more than usual on the PS90 because the platform's horizontal feed has no traditional mag well to peek at. FN's factory mags are the reliability benchmark. Aftermarket KCI and ProMag options exist at lower price points, but the FN OEM mag is the one PS90 instructors and competition shooters run when they cannot tolerate a feed failure.

Key wear item: the rotating mag follower drum and the polymer feed lips can crack after years of hard use. Inspect mags annually and rotate stock if any feed-lip cracking appears. Dorin Technologies makes Delrin replacement mag rollers that reduce friction and extend follower life on factory mags.