Misleading graph! https://skeptics.stackexchange.com/questions/40697/did-the-u...

"Tthere are notes about anomalous events included in each year's numbers. Since the numbers are so low these can throw the graph off. In particular two large events which happened in previous years were reported for 2003 and 2017 respectively which accounts for their anomalous spikes.

    2003 includes 172 victims of Dr Harold Shipman, one of the most prolific serial killers in history. While these killings happened over 25 years, they're recorded for 2003.
    2017 includes 96 victims of Hillsborough which happened in 1989.

The data notes other large, anomalous events are noted which can explain spikes in individual years.

    2001 includes 58 Chinese nationals who suffocated in a lorry en route into the UK.
    2004 includes 20 cockle pickers who drowned in Morecambe Bay.
    2006 includes 52 victims of the 7 July London bombings.
    2011 includes 12 victims of Derrick Bird."

I would also add that that data is for England and Wales, which excludes both Scotland's notorious history of stabbings and the three thousand deaths in Northern Ireland throughout the Troubles, prior to 1997. Some of which were using Armalite AR-18 rifles, as made famous by the murals.

You'd have to collect the guns for it to be effective. There are over 300 million generally unregistered firearms in private possession today, that might get a little tricky.