There is no reason. If you need it that quick then you are worring about the wrong stuff at the wrong timeI’m hearing all sorts of reasons for a DETACHABLE bipod, but very few reasons for a QUICK detach bipod (that’s what the “Q” in “QD” stands for).
I have all sorts of reasons for wanting all my bipods to be detachable, but I have never needed a QUICK detachable bipod.