there dufus are genuin duffus, but they also sell big cheese barrel traps, i tried the big cheese ones a few year back, there in a box now waiting to go to the tip
i think i saw some flat packs half barrel traps on BOBNETS stall at melton a few months back( if he reads this he can confirm what they were). very strong , thik plate and strong springs, but i wasn't impresed with the triggers and catches they seemed loose, and fired whilst i was handling them. but like i say they may not have been flat pack