i want to get in to more serious airsoft guns but i want a ak style gun(perferably folding stock carbine) full metal internal and externally only exception being for-grip pistol grip and stock can be wood or some form of high impact plastic lookingspecificallyy for the one with most range and accuracy i can get (i am willing to buy after market upgrades such as better springs, motors, tight bore barrels ETC to achievee this) only limit i am imposing is a 500$ top cost pre-upgrade.