BudsGunShop.com - Beretta M9a3 COMPATIBLE WITH 92FS 15 RD MAGS?

Hi Peter, Yes, the magazines are the same size. The 10 round is just blocked internally to only hold 10 rounds.

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Yes, the magazines are the same physical size between the 10rd and 15rd magazines. The 10rd is just blocked internally to only hold 10rds.

yes they will fit just fine