No need. 40mmx46 medium velocity has been with us for 4 years now. Shoots to 800m, with 30% more blast, from an M-203 or M79 type. The reason it's not in service is purely one of bureaucracy, as far as I can tell. It's certainly no secret and the infantry fire support topic for some time.
Light Mortars are excellent. Not as inaccurate as commonly supposed, very fast into action, and very high rate of fire. Because they don't "fire blanks" on exercise, everyone underestimates their importance. All you need for sights is an "Inclinometer" and something to align the weapon with. There are even computer training packages for them.
I used to carry the 51mm as a Platoon Sergeant.
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