I'm currently running a Beretta 9000 9MM as my EDC gun. I just want to know if the adapter (http://defensearms.com/store/pc/viewPrd.asp?idproduct=1453) is required to use full size Beretta magazines in the 9000. I know that full size Glock magazines can be used in a sub-compact without an adapter. But...that's GLOCK not Beretta. Thanks.