Don't know where you heard those rumours - They are very similar to the FX Verminator (in the action) but with the longer stock.
The wooden stocked ones are very fancy indeed but I'm considering the synthetic stocked version. ( I will disable the return spring on the biathlon lever ).
Which would take my FX collection to 6 !!!
Although I had an AA300 & liked it I wasn't keen on the rather victorian 'boilerplate' look of the AA410.