Re: USA: Early M4 hulls with L40 gun?
According to FM 23-95 75-MM TANK GUN M2 (MOUNTED IN MEDIUM TANK M3)
May 4, 1942, the gun was measured "Length (muzzle to rear face of breech ring)". I would imagine it would be the same for the 75-MM Tank gun mounted in Medium Tank M4.
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