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Not much lower than 82% for the general population, but definitely MUCH higher than the NRA leadership. I've forgotten the number, but most NRA members, normal citizens who undergo them themselves, actually believe gun purchases require background checks.
Although the Brady law requires background checks be conducted by commercial gun dealers, at least 40% of gun sales (last study 15 years old) are private sales not involving background checks. (BTW, eBay and Craig's List do not allow sales of most weaponry.)
Not all background checks are equal, some not so good, but "...states with specific checks for restraining orders, fugitive status, mental illness and misdemeanors, which are considered more comprehensive checks, are associated with a 7 percent reduction in homicides and a 2 percent reduction in suicide deaths. Also, firearm homicide deaths are 13 percent lower when states have checks for restraining orders and 21 percent lower when fugitive status is checked." What states wouldn't require background checks for people with restraining orders on them and fugitives, not to mention the mentally ill? Apparently a bunch.
Most guns used in mass murders were legally purchased.
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