MG 151/20

The MG151/20 is a German (Luftwaffe) 20 mm cannon used in many of its fightercraft.
I basically use photos and some technical schematics found on the internet as reference to recreate this weapon.

After finished this I intend to work on a 30 mm MK108 gun, both are used by the Heinkel HE 219 "Uhu", the aircraft I am planning to work out.