The US military's adoption of the Sig Sauer M5 (M7) rifle and 6.8x51mm cartridge signifies a major shift from the M16/M4 platform. While the new system offers increased power, concerns remain regarding extreme operating pressures (80,000 PSI), potential for reduced barrel life, significant recoil in full-auto, and logistical challenges like breaking NATO standardization and increased ammunition weight/volume. The accompanying Vortex XM157 smart optic adds advanced targeting capabilities but also considerable cost.
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