As far as I know, the F-4 came with different armements, the WB variant (2x 7,9mm MGs + 1x 20mm 151/20) being the weakest.
One gun package I read about was this:
2x 7,9 mm MGs in the cowl
1x 20 mm 151/20 in the nose
2x 151/15 mm in the wings
In "Fighter Aces of the Luftwaffe" (the one by Toliver) there's an original kill report by Adolf Galland, for a Spit 5, that he shot down in a 109 F-4 (or F-7, not sure here..)
The report is real thorough (german bureaucracy, you know?

) and it mentiones all guns and ammo types used in the attack. If I remember correctly, his 109 was indeed equipped with the above gun package.
Since AH models different gun loadouts (thank god!), I'm pretty confident we'll see more than just the loadout known from the WB 109 F.
Sascha
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Jagdgeschwader 77 "Herz As!"