M-68 105mm main gun out of an M60A3 tank. Fun doesn't even begin to describe it. You feel invincible. Same gun in the first M1s, (before the upgrade to the 120mm)
I always liked destroying things with the 165mm main gun on the M728 CEV (combat engineer vehicle). The 165mm HEP rounds will mess up a lot of stuff. The M728 CEV was nothing but a M60 with a short 165mm main gun, bull dozer blade, and an A frame for heavy lifting.
THIS. I have bragging rights to having fired the largest rifle in the world, an M67 90mm recoilless rifle. it was very fun to hit a tank at 600-meters.
The combat engineer battalion I was assigned to from Jan 92 till Dec 94 still had recoilless rifles in our arms rooms. We rarely got to shoot them though.
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