The R-2 Amendment's melee attack seems to have less stagger than your standard gun bash

As the title says it seems to me that the bayonet attack of the Amendment has very little stagger. I recently started using the R-2 again because it's a decent weapon. When fighting bugs with it I felt something was off. I often pop the heads of Alpha Commanders, let them run at me, then melee them interrupting their attack. By the time they recover they have already bled out. I couldn't do this with the Amendment though so it was throwing me off. Has anyone else found this to be the case?

The Helldivers wiki says the R-2's bayonet has 20 stagger force and 70 push force. I know that the standard melee gun bash does something like 40-50 damage(without Peak Physique) but after looking I haven't found anything that gives its stagger or push force number values. Does anyone know what the stagger value is for the basic melee gun bash? Perhaps it's varies for different weapons but all I know is I've never had a weapon's melee fail to interrupt a non charging Alpha Commander's attack before. I think bayonets on guns should have at least equal stagger to a gun bash if not more. Anyone agree?