An uneven rail system as the target comes towards you?
A Red Rider wagon with the rubber taken off the wheels.
Hey, it's a suggestion.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)