Hmm, I can only find how to do that as a UK VAT registered business, and only for business supplies:
https://www.gov.uk/guidance/refunds-of-uk-vat-for-non-uk-businesses-or-eu-vat-for-uk-businesses
It doesn't seem like GunFire / TaiwanGun or any other Eurosellers
should be charging EuroVAT on exports, as it means it gets paid twice to two different protection rackets. I'd have wonder if they're simply pocketing it as profit.
I have similar suspicious about AliExpress sellers who claim to be paying UK VAT and duty at source, so that goods can come through UK customs. Good for us, but I do wonder - are they really paying it, or just slapping a label on the package.