That would be partially wrong as the 6.5 Grendel was designed to fit the M16 mag well. It like the 6.8 spc also use a different follower. Both do a bit better, (if my memory is correct) when they use a mag with slightly shallower dimple depth in the construction. Those elongated grooves stamped in the sides. Both have around 27 rounds capacity vs. 30 for 5.56. On the topic of the US Gov adopting either one as a new standard, I doubt they ever will in all seriousness. The 5.56 is to intetrated into the US military as well as our NATO allies. We drug them to the 5.56 almost kicking and screaming to stay with 7.62 NATO. Many countries were not happy with the new (back when we pushed it) 5.56 round to be the small arm rifle standard round of NATO. All those countries with FN FAL type weapons and Germany with hits G3 had to develop and replace with new weapons in 5.56.
Until they actually come out with a Plasma Rifle or man portable Laser Rifle I think 5.56 is here to stay as a Mil standard around the globe. Then the conversation will change from how many rounds can you carry per pound of payload to how many pulses you get per battery pack and what those weigh in at.
Originally Posted by Schuetzenman
That would be partially wrong as the 6.5 Grendel was designed to fit the M16 mag well. It like the 6.8 spc also use a different follower. Both do a bit better, (if my memory is correct) when they use a mag with slightly shallower dimple depth in the construction. Those elongated grooves stamped in the sides. Both have around 27 rounds capacity vs. 30 for 5.56. On the topic of the US Gov adopting either one as a new standard, I doubt they ever will in all seriousness. The 5.56 is to intetrated into the US military as well as our NATO allies. We drug them to the 5.56 almost kicking and screaming to stay with 7.62 NATO. Many countries were not happy with the new (back when we pushed it) 5.56 round to be the small arm rifle standard round of NATO. All those countries with FN FAL type weapons and Germany with hits G3 had to develop and replace with new weapons in 5.56.
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