Hang a couple of layers of old carpet in front of the wood - loosely if possible: either use a wood baton across the top for a spacer between layers or staple the front layer of carpet to back of the wood and then flip it over. The slight movement in the carpet will absorb enough energy to stop pellets coming back, fine for 6ftlb rifles so overkill for 2 or 3 ftlb pistol.


Not that you need to worry... they'll all be in the black anyway, shirely?