All SAF armskote from recruit until reservist the weapons are
placed horizontally, never verticallly. Cos all the oil will flow
into the backside.
I was an armskote spec (sian job) in BMTC... weapons were stored
vertically.
And of course when I was in unit they did the same as well, plus
some horziontal mixed in... it depends on what kind of racks you
happen to get I suppose...