B&T has a handy loader for their B&T MP9 and it works for HK MP5 magazines as well.

As a CZ Scorpion Evo3 owner, I would love to see this design made for the Scorpion mags. I wonder if this could work for the SIG MPX Lancer mags too?

You can buy the speed loader from HKparts.net for $24.95.