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Oddly enough, that isn't exactly the case. The M1 design is surprisingly future-proof. Especially since they fitted 140mm guns on the damn thing for testing.


What would probably happen would be the US's ETC project would have been forced forward, leading to the first ETC guns numerous decades early (between peace dividends and the data getting wonky during testing of ETC propellants, the program was scrapped). Remember, the US had an ETC project during the late Cold War and was originally started to replace Phalanx CIWS systems (the prototype was a guided 60mm revolving autocannon system). The US Army part of the program was toying with 120mm and 140mm ETC guns (the M1 that was used to work with the 140mm gun was called 'Thumper'). At the velocities that ETC guns can generate (~2-4km/s), DU would be practically useless (the biggest reason that the US uses 'short barreled' guns is that DU has this very useful property of self-sharpening with a side order of setting everything on fire but at the cost of velocity as 1.55km/s is the 'acceptable' velocity for the self-sharpening property) in comparison to tungsten.


So, we'll be seeing M1s with a more efficient turbine (the M1 hasn't gotten its original turbine design replaced in decades, which is why it's considered a gas guzzler, although the APU that was supposed to be fitted onto the M1 got added on in one of the early upgrade packages because Congress thought having one was too expensive at the time).


Eventually you would likely get something that looks like a bog-standard M1 on the outside, but under the hood, it's a whole other beast.


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