BudsGunShop.com - Ca compliant?

Yes this'll work with Standard capacity magazines no problem.
Standard 14rd magazines are in stock here
budsgunshop.com/product_info.php/products_id/37216/beretta+jm4px4014+px4+magazine+14rd+40s&w+blued+steel

Robert, you sure can. Have a great day!

Robert, yes Sir you can. Most manufacturers including Beretta make firearm packages that have 10rd magazines so their pistols can also be sold in states that have magazine capacity restrictions. The pistols are exactly the same but just have 10rd mags included. The pistols will also accept any standard capacity magazines just fine. Cheers and stay safe!