Dont go and get any gun you think looks good. that may have been true in the past, but with such a selection of well priced full metal guns.
You'll go out and buy a TM M4 and before you know it, your barrel is gonna wobble more then a bowl of jello and your body tabs will be busted. Save yourself piles of money and trouble and buy a solid gun.
G36 or Full metal M16/M4/AK47