This is where I was going with an idea similar to this a while back,on another thread.
I see that they are still developing a vest where you can feel the reactions to getting shot etc.which I don't know if it's a good idead or not.The jury's still out on that one.Still,a light gun would be good.

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"Police up your spare rounds and frags.Don't leave nothin' for the dinks." Sgt Elias Grodin-Platoon