A 120mm Light Recoil weapon is probably going to be what we're
using, while 105mm rounds can probably penetrate malaysian frontal
armour, as the Israelis have proven in their encounters against
T-62/4 and T-72 tanks, the 120 mm gives you a larger margin in
penetrating armor over distances and all stike angles and longer
range. What is a lucky hit with at range with a 105mm APFSDS round
in which the penetrator glances off or breaks, will be a
penetration with the 120mm, why do you think the Israelis upgraded
to 120mm, with some concepts of 140mm even?
Of course, malaysin T-80 frontal armor might even be proof to
105mm...