105s are effective against tanks from the T-72 lineage. Modern sabot rounds are not defeated by ERA bricks.

There are also a lot of IFV vehicles on the modern battlefield as well as wheeled armored vehicles like the Centauro and Stryker MGS.

105 equipped tanks can handle these threats with ease.

What's the most common enemy on the battlefield? The few thousand new generation MBTs that countries can afford or the hordes of T-54/55, Type 59 derivatives still out there?

Do you really need a kill at 3000 meters in covered terrain where you can only see 1000 meters? Also tank gunnery is at center of mass of the target. If that new tank (or updated old one) is covered against a 105mm APFSDS from the front-- can I get a hit when it will inevitably shows its flank to me and I can penetrate the hull armor?

Most of the fancy standoff armor is for shaped charges not SABOT. Not every engagement is at maximum range on a pool table like desert so a 105mm can work fine in many cases. And there's humidity and haze that reduces range most places. There's often no clear sight picture at extreme range in temperate environments.

So again that 120mm might be "just in case" as opposed to absolutely necessary.

Or was it those exhaustive studies the JSDF did on weapons effectiveness against giant monsters? They found that 120mm offers no advantage over a 105mm against giant monsters.

BTW, I served with one of the guys who wrote the gunnery manual for the MGS. You can kill anything an M60 (or Type 74) can which includes T-62 and T-72. T-80 flanks and rear.

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105s are effective against tanks from the T-72 lineage. Modern sabot rounds are not defeated by ERA bricks.

There are also a lot of IFV vehicles on the modern battlefield as well as wheeled armored vehicles like the Centauro and Stryker MGS.

105 equipped tanks can handle these threats with ease.

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When i was at Stryker leader course they told us the MGS was not to be used to fight tanks and that it was an infantry support weapon, in essence a door knocker. But after talking to some of the armor officers they agreed that you could technically shoot some vehicles such as bmps and btrs but that you were to not try and pick a fight with tanks. I do believe that the MGS could be used as an ambush weapon that shoots and scoots, essentially a modern day stug in some respects but they made it sound as if the only thing you’d do was get a mobility kill on anything bigger then a T-62

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What I was saying is that a 105 is more than enough to take on a Stryker MGS type vehicle like a Centauro or like the MGS or whatever foreign equivalent there is.

While a Stryker MGS would get pwnd by an actual MBT, it could win in the ambush mode you mention. The problem is that tanks often operate in at least a platoon formation. It gets one tank, the others get him unless they were also employed in platoon formation and not parceled out one gun per infantry platoon.