Quote:
Originally Posted by ChalkLine
Now I think of it, the 'Cartridge, Caliber 5.56 mm, Ball, M193' adopted in the early sixties may not play well with M4s designed in the late nineties so the 5.56mm ammo may need to be changed out as well
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There are considerations, as this delightful document will tell:
https://www.dau.mil/cop/ammo/DAU%20S...ith%20Ammo.pdf