Equities researchers at Jefferies have gifted Games Workshop Group PLC (LSE:GAW) with a 'buy' rating on news that the Warhammer 40k manufacturer reached an agreement with Amazon.com Inc (NASDAQ:AMZN) to develop the group's intellectual property into film and TV productions. Amazon has also been granted merchandising rights for the Warhammer 40k universe, which is a popular turn-based science fiction game played with intricate miniature figurines.