Bf 109K4 MG151

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Alcatraz SK

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Aug 1, 2025
Is there technical data or official source where is stated that mk108 could be switched for mg151 in center if needed as it was possible in G variants of bf109 ?
 
If you can read German or have a way to translate, then here's the handbook for the 109K. The answer your looking for maybe in it....
FYI, this is only Part 9A - Allgemeine Ausruestung (General Equipment). The armament is in Part 8A - Schusswaffenanlage if you have it.
 
Is there technical data or official source where is stated that mk108 could be switched for mg151 in center if needed as it was possible in G variants of bf109 ?
I would be very interested to see anything original written about this, because I have not seen it.
So, the basic point you make "mk108 could be switched for mg151 in center if needed as it was possible in G variants of bf109" is, I think, incorrect. The modification to fit the MK 108 into the G-6 as the U4 was a considerable difference that would be done as new-build or possibly complete rebuild. The front fuselage forward of Frame 1 is completely different, with a completely different ammunition feed structure, the MK108 mounting and installation is completely different, the rudder pedal assembly is completely different, etc..
The K-4 is of course also different in details, but similar differences that suit the MK108, not the MG151.
If a K-4 was built to have the MG151/20, it would be very different indeed.
It is possible that someone thought the 151/20 might go in some K-4, but it would be a very big modification.
I have not seen this possibility in my K-4 documentation.

Eng
 
I would be very interested to see anything original written about this, because I have not seen it.
So, the basic point you make "mk108 could be switched for mg151 in center if needed as it was possible in G variants of bf109" is, I think, incorrect. The modification to fit the MK 108 into the G-6 as the U4 was a considerable difference that would be done as new-build or possibly complete rebuild. The front fuselage forward of Frame 1 is completely different, with a completely different ammunition feed structure, the MK108 mounting and installation is completely different, the rudder pedal assembly is completely different, etc..
The K-4 is of course also different in details, but similar differences that suit the MK108, not the MG151.
If a K-4 was built to have the MG151/20, it would be very different indeed.
It is possible that someone thought the 151/20 might go in some K-4, but it would be a very big modification.
I have not seen this possibility in my K-4 documentation.

Eng
Yeah I didn't see any mentioning of it, but wondered since G version could swap it andany ace pilots prefered 20mm .
 

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