Personally, I never encountered any "Stripper Clip," ammunition for the M16. (1980-84.) We always loaded individual rounds by hand, into the magazines.
Perhaps others have a different experience. (?)
Extreme NE TN/W NC ya'll. 😁
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We had the 840 round cans when I was in 74-76. 2 cans to a wood crate. On the only actual move out alert I ever participated in, we issued a wood crate to every truck in the battalion, movie style as they circled the ammo dump on the way out the post. The ammo was issued with the stern warning if the seal was broken when it was time to turn the ammo back in, they would be counting that ammo every day until they were reassigned.It worked 2 days later when the ammo was returned not one seal was broken.