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Fabian, the magazine extension you need is sold by Beretta at : https://www.berettausa.com/beretta-px4-sub-compact-magazine-adapter-black/eu00036/

the magazine extension you need is sold by Beretta at : berettausa.com/beretta-px4-sub-compact-magazine-adapter-black/eu00036/

It's meant to accept magazines from compact and full size.They also have a slide over sleeve for full size mag, that fills gap between gun handle and magazine floor plate.But if minimun size,for concealing,is a concern,than the best option is a magazine with "snap grip"