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Looking at this, that cutout on the model is not correct.
Well I haven't bought the kit yet. I prefer the classic 8 gun flush look anyway, so I could look around for a different kit...C'est la vie. The kit is one of the oldest sets offered by the Tamiya. What was correct 20 or more years ago is not adequate these days. Such details are easy to correct so no trouble with that should be.
I'm very sorry but I have messed the model kits. Here are shots of the 1/72 wing parts of the Tamiya 60748. The slots for MGs can be noticed.
View attachment 695168
View attachment 695169
the source: Spitfire Mk. I im Maßstab 1:72 von Tamiya # 60748 | Modellbau für alle mit Spaß am Hobby
Must be an optical illusion. On the photo, the gun ports look much bigger than what the schematic shows.....It's a matter of scale IMHO.
Here is the Mk.I wing structure ...
View attachment 695171
the source: the net.
Like most upgrades I suppose it took a while to get around to all aircraft.. Actually I should find out what squadron the Tamiya kit decals cover. Then some BOB photos of that squadron should shed more light.And one shot more dated 1940 in France ...
View attachment 695259
the source: RAF No 602 Squadron Spitfire photographs
and the next dated on March 1940. No protruding barrels there ...
View attachment 695262
the source: RAF No 602 Squadron Spitfire photographs