In the early 2000’s, there was a big push from the U.S. Army to adapt new, more powerful cartridges to the M4 carbine. This initiative was prompted by battlefield reports of enemy combatants taking multiple hits from 5.56 NATO rounds and remaining combat effective.
Continue reading 6.8 SPC vs 6.5 Grendel: Enhancing The AR-15 Platform at Ammo.com here https://ammo.com/comparison/68-spc-vs-6.5-grendel
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