Originally Posted by
lysander
Oh, and one more thing . . .
Two versus three different caliber ammunition is not as big a deal as it once was. In the pre-World War 2 world, ammunition came one form, bulk boxed rounds. Belted ammunition was locally made up. And, logistics management was not as good as today.
Today, ammunition for an M249 is essentially completely different than ammunition for an M4A1. While it is theoretically possible for the M4 operator to de-belt and shoot M249 ammunition, and theoretically possible to collect used links and link ammunition from stripper clips, it is not practical as links are not salvaged off the battlefield.
In reality, since the 1980s the US has had at least five types of small arms ammunition, not counting Caliber .50, 40mm Grenades for the M203, 40mm grenades for the Mk 19 (which are not interchangeable), 9mm, or Caliber .45, in the system: namely sniper ammunition, belted 7.62mm, clipped 7.62mm, belted 5.56mm, clipped 5.56mm. Then you also have 7.62mm packaged in 600 round belts, which is not practical for infantry use. . . .
Today there are 121 different DOD Ammunition Codes, each with a unique NSN, for 7.62mm ammunition, 137 for 5.56mm. Many of these are treated by the supply system as "non-interchangeable".
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