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Only place I've seen the mags was at Wolverine Supplies. Unfortunately, they are out and don't know when more are coming in. If anyone knows where to find some, I would also be grateful.
P&D had some P99 .40 mags in stock last week I think. They have the same mag body as the 9mm, and fit in a 9mm PPQ, but the feed lips are about 1/64" too wide to reliably hold 9mm cartridges.