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Mr. Clean magic trench eraser
(slrpnk.net)
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Can someone calculate max theoretical thrust from firing these?
https://what-if.xkcd.com/21/
For an AK47 it'd be 57.2N, so probably a bit less times 88, totalling something below 5000N or so for the ejected bullets, plus 30% for gas n stuff.
I highly recommend the xkcd in any case.