What can you buy cheaply in the US that is more expensive in the UK?

You can own an AR15 legally here, it just needs to be a .22 if it’s a semi auto, or a straight pull if it’s a bigger calibre. The difference is here you actually need a reason to own it. England and Wales have 2.73m firearms in civilian hands, 4.6 per 100 people, Northern Ireland has another 296k, 11 per 100 and Scotland has 305k, 5.6 per 100. These figures are obviously nowhere near as high as Canada, Finland, Australia, Norway, Switzerland, Sweden, France, Germany and other gunned up nations on the continent, nor New Zealand, and are not even on the same planet as the USA, which has more guns than people, but we have far more than most Brits realise.