Move to the USA, and buy all the guns you want, and live where you want.
Better qualify that statement. Here in Massachusetts, you can't buy a gun with an "assault magazine," eg a weapon that hold more than 13 or 14 rounds (tubular mags exempt). You can't buy handguns unless you are 21+, there is a ten day waiting period (or is it thirty?) for buying a gun, and I would not be suprised if they report you if you buy certain guns in quick succession (but I'm just guessing on that one.)
Welcome to MA,and abandon all hope, ye who enter this place...