Answer:
I am whole but incomplete. I have no eyes yet I see. You can see and see right through me. My largest part is one fourth of what I once was.
I get paid to shoot people then blow them up.
You can read me both ways I wear; One way it's a number reversed a snare.
I go around a yard but do not move. What am I?
When I come in from sea to shore twenty paces you'll see No less no more.
When is it bad luck to see a black cat?