Rear sight for Mossberg AT600

Try US ebay. It is not a component part so there should be no problem importing it in the post.

Failing that, find out who imports Mossbergs into the UK and put an order in with them.
Go to Mossburg website customer service, Some years ago I smashed the pistol grip on a 44 Dan Wesson and phoned them for a replacement and they sent it for free, so you never know your luck

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