Beretta USA Store Verified Purchase
Honestly, I was upset when I purchased 3 extended Magazines for the Px4 .40 and it would not hold past 15 rounds. I went back to the reviews to find others having the same issue. However, after I disassembled the stock magazine and the extended magazine, I swapped the springs and sure enough it worked with 17 rounds. Also strange, after I swapped the springs to that one magazine, my second extended magazine loaded 17 rounds without me having to replace the spring from the stock magazine. I believe the track in the magazine gets jammed when loading last two rounds; you probably gotta break it in by taking a couple shots at the range or taking the thing apart. All in all, they fit 17.
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