Unable to fire out of bunkers

[fastphil]

It's from Stalingrad '42.  I'm trying to fire with infantry in the bunkers against the German stack .The German stack contains armor, infantry, and guns.  I only have infantry in the bunkers and I would assume that I could shoot the infantry.

What optional rules are you using?  Usually direct fire is at a unit-if you are firing at a 'stack' with a unit that hasn't a hard attack factor(or 0 range) , it won't be able to fire at an armored unit at a one hex range.