You could do what I'm currenly doing in my W.I.P. TDM, which is:
[/] [0] onActivate->Self->VCE_ifValue-><var:client:score>[>=](for example, 1)
[/] [0] onVariableTrue->Client->IncScore->[-1]
What that does, if you don't know, is checks to make sure the player's score is greater than or equal to 1 when they activate the brick, and if it is greater than or equal to 1, it takes one point away from their score. You can add more stuff to that, such as:
(after the second event)
[/] [0] onVariableTrue->Player->addItem (if you have the
addItem event by Destiny)->[some gun you have]
So if they have greater than or equal to 1 point, it subtracts one point from their score and gives them a weapon. I hope that works for you, if I understand correctly what you're trying to ask.