Just FWIW, that is the reason Mauser put a bolt sleeve lock on the Model 1898 and Springfield put one (of a different design) on the Model 1903. The American designers had never seen a 98 Mauser, but they also recognized the problem of a bolt sleeve coming unscrewed accidentally and corrected it. So with those guns, the bolt sleeve can still be unscrewed, but at least it has to be done deliberately.
Jim
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