I too had this problem. Bought my .40VE 12/07 and had it case kept until about 2 months ago. Never shot it till I moved out to the country and wanted to have some fun with it. 3rd clip into my fun, I got about 3 more rounds out of it and wallah, Sight was GONE. ShYtty!
Called SW and they sent me a shipping label, I sent it out, received it 8 days after handing it to the FedEx Driver. You should have NO problem getting this fixed and FAST. They do NOT however change the design. They just melt a new one on and apply a hardener or some kinda bullshYt.
Either way, I sent it out on July 5th and got it back the 13th and couldnt be happier. Just hope it stays on from now on, otherwise I may have to ask SW for some kind of compensation for being FORCED to use aftermarket sights for reliability. Good luck.