Professor Shane critiques the U.S. military's transition to the SIG XM7 (M7), highlighting the challenges posed by its 6.8mm cartridge. He notes increased recoil, heavier ammunition, and faster barrel wear compared to the M4's 5.56mm system. While the 6.8mm performs well in the M250, its effectiveness in the M7 is questioned due to heat and longevity issues, potentially impacting soldier training and hit probability.
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