The ducks are kept too much of the magnet. Either the magnet with adhesive tape or those little plates that (similar to cabinet door magnets) bundle the magnetic effect remove. Guns are sometimes too weak to draw up the duck again. With 7.5J airguns trouble-free operation. Higher energies damage the box / targets too much in the long run! Works best with stino flathead pellets. Aufrichttarget in poor lighting conditions more difficult to make something further back in the box (By design)