BF109 F 20mm nose cannon

[George Hopp]

Its actually taken from Rolf Pingel's RAF intelligence report after he was downed in a BF109F over England.
He stated he liked the single nose 2cm weapon, though it fired high, and the report then claims the weapon can be cleared of jams in the cockpit by the pilot whilst in combat?

Note that Pingel did not say that he had actual access to the central firing gun, but that he could clear the jams from the cockpit. And that would have been done with the charging control as noted by Jukka. So, what he said was accurate, and the intelligence report was accurate. But, you need to carefully parse the wording.