1870 as a date may have some context from that being the time that firearms licencing began in the UK, as well as it being a time that general design was changing - which means there are those that look ‘modern’ and precede 1870, but also those that look ‘historic’ and were still developed after 1870
Its self preservation by the seller to require a VCRA defence, which does not necessarily have to be UKARA
As long as you are an adult you can buy any airsoft gun - but they may only sell in bright colours