Sadly, I don't own them - but I did take the photo myself. From left to right, they are:
Gerat 03 – Roller locked variant of the G43
Gerat 04 – A 7.92×33 Kurz version of the Gerat 03
Gerat 06 – Gas operated, roller locked, stamped receiver
Gerat 06H – Retarded roller locked, stamped receiver, produced as the StG45
CETME
HK91
HK93
MP5
At the bottom are an MG42 and a CZ52. Both the 42 and the MP5 are fully transferrable.
Those guns literally are the whole history of roller-locking, from start (MG42) through experimental iterations (the Gerats), postwar development (CETME), mainstream adoption (HK91) and proliferation (HK93 & MP5).