Gun shields are usually installed only after real
bullets start to fly.
In Vietnam war, the first
M113 50 cal guns came without gunshields.
These were installed once casualties of 50 cal gunners mounted
quickly. Later, gunshields were also added to the 7.62 MGs at the
rear fo the M113s when it became clear they prolonged the
lives of these gunners. Ditto for other vehicles
in Vietnam as gunshields were installed on every pintle
mounted MG including those on trucks, tank commander MGs etc.
This lesson is being learned again in Iraq & Afganistan
where gun shields are fitted to loader's MG on M1A1s,
gunner MG on Humvees & Warthogs etc etc
It is actually a no brainer that gunshields shud also be
installed on SAF vehicles and especially the commander MGs for
our Leopards, Bionixs, Broncos etc etc.