Re: What a load of Trump...
"However if the UK had the same gun controls as the USA we'd probably have just as many mass shootings as the US does."
I doubt that. The US culture is largely to blame. But the UK comparison is only hypothetical.
Compare the US instead to other countries with high levels of gun ownership, such as Switzerland, Finland, Canada, Austria, you find relatively little gun crime.
What's specific to the US is three things: the casualness of gun ownership, the weak and amateurish regulation, and a bizarre tolerance of selling assault rifles to those with no valid reason to own such weapons.