AXSR VS AXMC Barrel Contour

[RomanM1A]

I know barrels are interchangeable, but I'm wondering if the contour changed between generations. Does anyone know?

 

[ShootnFool8]

tag...

 

[ma smith]

I'd be very curious to hear definnitive answer on the long actions. There were definietly changes to profile over the years.

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[Bugholes]

The early MC barrels had a flange on them that was 1.4" or so in diameter. It was rather short, just enough to widen the shoulder for support. It tapered quickly down to 1.3" dia or so, not sure. After 2018 I think, they switched to another barrel contour which is similar, or the same, as the AXSR. The 2018AIMC contour was/is 1.33" for about 4", straight taper to .975@12", and .975 straight to the muzzle.
The M30 tenons and headspace are interchangeable between the MC and SR.