Found this online
This may be old news to you guys but I was wandering the net and came across a report about an FBI study on "cop attackers and their weapons" in the Force Science News from 28 Dec 2006.
Predominately handguns were used in the assaults on officers and all but one were obtained illegally, usually in street transactions or in thefts. In contrast to media myth, none of the firearms in the study was obtained from gun shows. What was available "was the overriding factor in weapon choice," the report says. Only 1 offender hand-picked a particular gun "because he felt it would do the most damage to a human being."
Researcher Davis, in a presentation and discussion for the International Assn. of Chiefs of Police, noted that none of the attackers interviewed was "hindered by any law--federal, state or local--that has ever been established to prevent gun ownership. They just laughed at gun laws."
Somehow I think that people like us already knew this.