Totally guessing, but it makes sense that it could be a real problem. The reason I think the concern is legit is because the plastic hoop is pretty thin (not at all robust) and then the PMM sling mount is going to act like a lever that is trying to pry the plastic hoop away from the gun. Since you're putting the full weight of the gun on this plastic piece (if you use it as a single-point sling) and then add to it extra loading from jumping around and running, and it seems perfectly plausible that the plastic hoop could break.