Yep, SW99 mags will work in a P99. Also, Magnum Research makes a licensed version of the P99 that has much more plentiful mags. I have 6 of the MR 15 rounders for my P99 and they work just fine, plus they only cost $35 instead of $50 for OEM Walthers. They're all made my MecGar anyways. Hope that helps!
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