Please do not attempt to purchase large capacity magazines from MBX if you reside in a location where you may not legally possess them. Magazines with a capacity of more than 10 rounds are illegal and cannot be shipped to California, Colorado, Connecticut, District of Columbia, Hawaii, Maryland, Massachusetts, New Jersey, New York, and Vermont. Please check your state regulations for ownership of high capacity magazines. Orders for high capacity magazines with a shipping address in these states will be canceled MBX Does have 10 Round magazine options for STI/SV & all 2011 Pistols.