Specs and parts
FuSpr F Radio
Mauser MG 151
These 3 pictures came from a US intelligence report on a downed Ju88. The middle one shows the mount as it was installed in de Junkers and on the Drilling.
The mounting name
Einling: mono mount (word used only in conjunction with multiple gun mounts)
The Army desperately needed anti-aircraft guns, and as the Luftwaffe had a bunch of MG's left over, so it transferred 15,000 of the MG151/15 and 151/20 weapons to the Army.
Designation: MG 151/15 (aka MG 151)
Designation: MG 151/20