old mods would continue using the "classic" way.
If it is modded, use the old method.
If, as I suspect, this is scripted (qvm or whatevah) then do this by adding new flags "doesn't affect weapon" "doesn't affect lower", "doesn't affect upper", "doesn't affect head". Old scripts wouldn't know that, reverting gracefully.
risk that from some angles of view one may not see it at all?
1. That's why the flashing aura of lightning bolts that propagate wider than the weapon itself.
2. There is too much motion, it would only happen if you were sneaking up behind and to the left of a quaded camper who stays still. He asked for it