You’ve been reading too much NRA literature! 2003 was just 4 years after the gun control legislation kicked in. In 2014, according to police records, there were 62 cases of murder in Scotland. That’s with a population of 5.3 million people — so that’s 11.7 murders per million people. The rate for 2014 across the USA was 45 murders per million people (according to the FBI). Four times higher. So…where exactly does that leave your argument?
Worse still, that number doesn’t include suicides and accidental gun deaths…if you include those, the numbers for the USA are around fifteen times higher than in Scotland.
The problem with the figures you’re quoting is that you’re looking a “assault” charges…not things that result in deaths (“murder”). You wouldn’t expect gun control to reduce the number of scuffles between drunken idiots outside a bar…but that’s what most of those assault charges will be.