Very sad for you, and a hard learnt lesson, the Uk is the home of the self taught and instant expert, and they are common on the internet, not so much fraudsters as people who are not as knowledgable as they think they are, and profess to be, and maybe even believe it themselves, and some commercial dealers fall into this category as well.
People who have spent a liftime in the trade, and have been factory trained, or a lifetime in the sport, and really do know what they are talking about are very rare today, but the enthusiast who has followed and researched on the internet, and even genuinly but misguidedly believes they know as much, are very much more common.
Its a sad fact of the modern environment that real experts are a rare breed, and even sadder that we should have to take the guidance and opinion of all other than the very well known and respected ones with a pinch of salt.
Walther KK500 Alutec expert special - Barnard .223 "wilde" in a Walther KK500 Alutec stock, mmm...tasty!! - Keppeler 6 mmBR with Walther grip and wood! I may be a Walther-phile?