They actually put .50 cals into the wings? I was only aware of the 20 mil Hispano cannon from Mark V onwards, I believe.
Yeah. The first Mark IX versions were basically Mark VC airframes fitted with Merlin 60 engine, which boosted their performance beyond that of the FW-190 A models which had been giving hard time for the Mark V's and even Mark VIII's. They proper Mark IX had pretty big modifications to its airframe, but the performance increase given by the new Merlin was such that they decided the rush the construction by fitting the engine into currently in-production Mk.VC airframes.
This resulted in Mark IXC with the
Type C wing, which was the "universal wing" for the late Spitfires, fitted with 2x20mm Hispano cannons and 6x.303 Browning machine guns (the wing also offered possibility for 4x20mm Hispano cannons without MG's).
Later Mark IX Spitfires had improvements to engine (Merlin 66 introduced injection carburetor which removed the negative G issues that the earlier Merlins suffered from), improvements in airframe integrity, control surfaces, and the
Type E wing which was otherwise the same as C wing, but it had options for either 2x20mm Hispano and 2x.50 Browning machine guns, or 4x20mm Hispano, but the latter variant was not often used.
Interestingly, latest HSFX mod for IL-2 has a duplicate entry for Spitfire HF IX E; the first of them has C wing with .303 MG's, while the latter has E wing with two .50-cals and no outer MG's. So, the first one is mis-named (should be Spitfire HF IX C for C wing instead).
Clean unmodded Il-2 1946 4.10.1 has correctly named HF IX C and HF IX E. I am so far not very impressed with HSFX as a whole. Sure, it's better than unmodded simply by the virtue of adding a bunch of cool stuff, but there are some things that have a bit of a sloppy execution.
I'll likely move back to UltraPack mod when the new version is released.