Many have seen castle nut loosen even with staking. TM specifies the castle nut to be staked in two places.
Those that don't believe in staking would cite "never happened to me" or "never saw it happen" as reasons, they're not reasons to me, but rather excuses for defending their position. Either it's done correctly, or it's done incorrectly. For a hobby grade AR, one can get away with improperly installed (i.e. non-staked) castle nuts, for everything else, it's a good idea to follow best practice and what Colt, FN, Colt, SOLGW, SIONICS, BCM, etc. do.
https://www.forwardcontrolsdesign.co...t_ep_64-1.html
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