I posted this in the wrong forum earlier, my apologies. I have a new to me FI industries Model D .380, looks like a small 1911, that I was working out at outside range the other day. Works great, accurate, that is until the front sight took off to who knows where. I ordered some spares but not sure how they are remounted. The finish is blue. I see no solder in the slot which by the way has a hole in the very center that goes through the slide. Does solder adhere to a blued finish? Will trying to solder to a blued finish hurt it? Or is the hole in the center a spot where you peen the sight to the slide? This last one I won't know until I see the new sight and see if there is a part of it the goes into the hole. Are there any glues such as Gorilla super glue that could be used that can withstand the abuse it would receive being used on the slide? Any suggestions, thoughts? Thanks, John.