Hope you would explain.
Imagine you're in a game where you're getting outmatched, your rifleman can hardly keep any offensive up and your opponent is going to get his first light in the field.
The M20 is here to help, you can apply good pressure, get fast dps(your compare the dps to the 222, did you check the scatter value on each?)
And...you get a free bazooka...
If your opponent is ostheer and happen to get a sniper, you can trade your M20 for it.
It's a expensive unit overall but it does its job.