As per the title has anyone got one that they could sell to me?
I had a swing off mounting system fitted and I was at the sighting in day with the gunsmith but now I cannot locate the mag anymore so it may have been left behind on the range.

Half a dozen for sale on EBay. Bit of a pricey thing to loose. .284 does drive up the price. .243/.308 are much more common and cheaper. Good luck. Maybe someone has an orphan one sitting in a drawer.

https://www.ebay.com/sch/Magazines/177879/i.html?_from=R40&_nkw=winchester+284+magazine+88

BUT I do not think these gun parts can be sent overseas

https://www.myus.com/benefits/shipping/customs-help/restrictions/

Bavarianbrit,
Take a look at Simpson Ltd. website.
Mike