I got one of the Comp Tac single mag pouches for Christmas. I haven't had too much use with it, but so far I don't have any complaints. Typical, quality Comp Tac product that is available for your P99.
Sorry my friend. I have to trial and error it, like my holsters. We all are different and have different expectations. I am in the same boat as you. I don't have a Walther P99, but have others I'm trying to fit up. Best of luck, wish I could be of more help..
When I carred my P99 I used the knife pouch that came with my Benchmade knife. It mounted sideways to my belt and it fit the mag like a glove. Double plus; buy a great knife and get a great mag pouch...
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