That has occurred to me and a co-worker friend of mine in our 590s. Heavy slug rounds (i.e., heavy recoil) were used and the fore-ends were being held but the bolts unlocked anyway.
IMO, unlocking prematurely is not good. Good chance of a rupture case.
Solution : Don't use excessively heavy loads. Stiffer hold on fore-end.
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- Ron V.
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