http://ww2db.com/aircraft_spec.php?aircraft_model_id=17dont be so doubtful And I recall reading somewhere they attempted mounting, I think, a 57mm cannon in the nose, stuck out some 7 feet though and had to have a counter balance in the tail... I'm trying to source that now.... but it was never operational in the sense that the 262 was.
Initially, two Me 262`s (Wk/nr 111899 & 170083) were modified to carry this new weapon