Actually there is...for some anyway...
While MecGar is the OEM for FNs BHP, and has been for decades, the commercial MecGar BHP magazines are not the same as those they supply to FN, and it goes beyond the MecGar logo. Current FN supplied magazines are finished matte similar to previous generations of FN BHP magazines and not the high gloss blue/black of the MecGars. AND, current FN supplied magazines are equipped with the "Mousetrap" spring which, for all the whining by some, actually solves the drop-free negative of the MDS...that has always been a part...for good or bad, of all but most 640b pistols.
It's mostly a nostalgia thing I guess, because commercial MecGar magazines certainly work well, in fact extremely well...but, silly or not, the FN BHP is a classic pistol deserving of magazines that would have originally come with that particular pistol. Spare magazines for range use is where MecGars come in handy...and I've got many, but when the BHP is carried...it is carried with FN factory supplied magazines of the vintage correct to that particular pistol.