Again, where's the fact production Ar 234B used these guns?
The RLM aircraft manual released 12/44 neither contains a part 8A (gun/cannon armament) nor does it mention them as Rüstsatz (optional equipment) nor has it load plans with these guns.
The Arado manual from 6/44 does not mention them either, the Exerzierkarte from 10/44 mentions only bombs as armament
Optional equipment listed in both manuals is recon cam, bomb aiming device (Lotfe), autopilot and aux fuel installation
We all know the guns were planned for the Ar 234A/B but did not made it into production, it was again planned for the Ar 234C and may have been used there.