The 3cm Mk108 cannon entered service during the fall of 1943. Use of a hub mounted Mk108 cannon should have largely negated the need for wing mounted cannon on late war Me-109s.
Hello Dave
MK 108 was fairly rare in late 109Gs (U4 mod) and had reliability problems, especially if fired under G-loads thanks to its heavy ammo. It became the standard motorkanone only in K-4
Juha