As I understood it (probably wrongly) - the riflemen use their rifles till their Junior leader says, 'here, have a Panzerfaust Karl' - which is then immediately fired, and the soldier then reverts to a rifleman instantly. So at no time other than the instant of firing are they equipped with the Panzerfaust.
I may use them anyway, as they are nice figures, with a notional Panzerfaust but counting as a rifleman. Going mad painting Splintermuster and Sumpfmuster on 1/72 figures. Plus it is so hot, the paint is drying on the brush before I can transfer it to the figures.