I have just tried levering under the point of the clasp with my finger (fairly hard) and pulling on the strap, neither caused it to pop open. I just checked, it's a FC5040 not a 5042 - it's on my 2018 AR with the fabric strap. It has had a LOT of hard wear, it's been on job sites, in engine bays, mountain biking and never come undone.
Where are you pulling yours to make it come undone?
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