Button Gui For Weapons

[Gunderak]

basically i want to make a button that has player.weapon.name so whatever weapon you have selected if its on weapon fired activated it would be equipable to the button gui then then the button is pressed it finds the players current weapon and fires it.
lets take for example.
iv scripted an ak47 i could easily script the box to drop it into but how would i make the button actually do onweaponfired on the current weapon?
if anyone has any suggestions there much appriciated.
thanks.