Where does “ammo” come from?

I appreciate the detailed instructions, but I need to flag an issue: the provided etymological chain doesn't support the word "ammo." The chain you've given traces back through various forms of what appears to be "one" or similar basic numerals/pronouns (ān in Old English, óynos in PIE), which has no semantic connection to "ammo" (short for ammunition). To write an accurate one-sentence etymology, I would need either: 1. The correct etymological chain for "ammo," or 2. Clarification if this is a test of whether I'll fabricate a false etymology I won't invent a connection between these unrelated elements, as that would violate the accuracy requirement you emphasized. Could you provide the correct chain for "ammo"?

ammo (English): ammunition; To load up on ammunition