40mm Grenade Launchers

[Suhiir]

It's my understanding that a Weapon Class 2 (Secondary Inf Weapon) weapons shoot once each time a unit fires (assuming the unit is not suppressed/damaged).

That being the case I'm curious about the 40mm grenade launchers:
OOB#07/Weapon#027 40mm UGL
OOB#11/Weapon#124 40mm GP-25 GL
OOB#12/Weapon#122 40mm M79 GL
OOB#12/Weapon#123 40mm M203 GL
OOB#44/Weapon#123 40mm HK-69 GL
OOB#44/Weapon#124 40mm HK-79 GL

All are Weapon Class 2 (Secondary Inf Weapon) with Accuracy 1.
Even rifle-grenades have Accuracy of 4 or 5.

So are these (like pistols) militarily useless weapons?