...reminds me of a "live" fire training system I saw at a trade show a long time ago.
Actual weapons (pistols, rifles, SMGs) were used, with an insert in the barrel, housing a shock sensor*, battery and laser.
The weapon was loaded with blanks, the shock of firing of which triggered a coded pulse from the laser.
The receiver was a vest woven with an optical leaky feeder, in a grid, so to a reasonable degree of accuracy, the hit point, and hence the lethality of the shot could be judged.
* later, a flash sensor was added when squaddies found out that if they ran out of ammo, hitting the the butt of the weapon with a rock could prolong their time in the "game".