[QUOTE=Is that a little blob of weld I can see, to fix the barrel to the main body?[/QUOTE]

Yes, I would say it is on the head of the UKicon required spec. Drilled through the receiver & barrel, to have a steel pin inserted. & the head welded over to prevent barrel removal.

UGLY & HORRIBLE!!!! What would it have taken, to have simply countersunk the hole after drilling the Recievier. Insert the pin, & weld it over. Then, dress flush & a small dap of paint?........
Even when you deactivate a weapon to make it a useless lump of metal. What happening to craftsmanship/ professional workman like standards?............