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Generally minefields are defended by infantry/anti-tank weapons rather then armor so the 105mm is a better choice for a mine clearing tank then the 75/76mm.
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That is true but considering that all tanks in the IDF are driven by tank corps crews, and are part of tank battalions, I expect the uniformity in ammunition and maintenance was valued above any tactical advantage of a 105mm/165mm howitzer. As I recall in my battalion the breaching platoon had rollers and plows but no dozer blades. These were mounted on regular Merkava Mk 2b with 105mm guns.
Generally the IDF prefers rollers/plows to dozer blades on its tanks, but here is a pic of a merk 1 with a dozer blade:
Here Puma engineer combat vehicles as well as 2 Nakpadon Heavy APCs and 1 M113 are seen. You can see that one Puma has a Roller and one has a Dozer blade. In other words both were and are in service at the same time.
