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I figure if a knife ain't detering them any, then it is time to bring out the gun.

Agree with you there. Actually any knife that you can get open with one hand will do nicely. Just like the guy on the Metro bus in Houston. He told the guy he was sorry he bumped him getting on. The guy started threatening him and moving towards him. He then pulled a knife out of his pocket and told him to back off. Guy kept coming and talking about beating him into a pile of pulp. So the guy used the needed force to stop the guys threat.

I my self would keep one spare just in case I would ever have to have it. God forbid I would have to use it but I would rather have the extras if I did need them.