the problem with the TOP guns is they don't have the same gear boxes like a TM or CA STAR etc, and they are prone to break, don't buy an assult rifle and add a bipod and a drum, that only works if you convert say an AK to an RPK, or G36 to an MG36, it ruins the reality point i think. i say buy an inokatsu also or go with the STAR or CA M249. also they can be big and heavy, and you seem like small guy being 13, just a guess. it might be troublesome for you, aslo being a very big gun.