I really wonder if these internet experts have any depth of reading comprehension. For those challenged in fundamental reading skills, I'll try to make it understandable.
GSG only recalled the "SD Model" fake suppressors....which happened to be the larger (1 9/16" diameter) of the two that were produced for the GSG-5's. If your GSG-5 had the smaller diameter, there is no issue. The smaller GSG-5 fake is the same diameter as what's offered on the 1911.