Pengman. You state your seller managed to 'Fix the issue'. It would be nice to know what exactly was done for future reference of other potential owners over there.
As a lot of good advice was given freely by members on this topic. It would also be good to follow this thread to it's sucessfull conclusion.
All he said was the problem was a result of slam fire? Something to do with feed ramps. I think I am just going to ask for my money back on this rifle. S in the mean time I am just going to have someone assemble a kit for me and convert it into semi auto