US Army Considers Adopting an Interim Battle Rifle in 7.62NATO: eventually adopt 6.5

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It depends on how political the Joint Chief of Staff has become. Under Obama the military took on all kinds of social experimental changes that was not conducive to a strong military or keeping the nation safe. There were many who were replaced by a more progressive thinking leadership to advance this agenda.

Social experimental changes in the military are not unique to Obama, nor did they begin with him. Following WWII, a "more progressive thinking leadership" undertook to integrate negro soldiers throughout the Army, instead of keeping them in segregated units as they had previously been. No doubt at the time there were a whole lot of white soldiers complaining about such a politically correct action being imposed.

I would love to see the cost difference between our M-855A1 round compared to the Russians 5.45X39 equivalent.

AFAIK, the Russians don't actually have an equivalent 5.45x39 bullet.

For cost comparison, the nearest equivalent is probably the 9x39 SPP.