The .300 WM magazines from MDT won't lock into place in the MDT cassis with the Howa 1500 barreled action.
Does anyone have a photo of the modification necessary?
Called MDT. They sent replacement magazine catch releases, one .010 undersized, the other .020. Both work. The .010 is a better fit.
Problem solved.
Bit of a struggle to chase the pin through the frame, catch release and spring, but got it eventually.
Great customer service.