The M855A1, a 5.56 mm Ball ... 1-in-7 barrel twist. The M855A1 has a copper-jacketed steel core, differing from the previous M855 round which has a lead core. The so-called “green ammo ...
By the time Congress got around to awarding the promised rifles to “Aiken’s Volunteers” on May 20, 1826, the U.S. Army had ...
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