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I have been there and done that, and it is not funny when you’re missing one tiny piece of an M-16 rifle. Especially that little pin that holds the bolt together. No, not funny at all.
Except in hindsight, many, many years later.
Quick tip, when you clean your M-16, take off your field cap and put that down on the table beside you. Put all the small parts in there so you can find them later.