Thanks for the tip Frank. I went ahead and ordered one this morning from Sig. I wanted one for a pistol I just built and I guess with a free rifle bag you can't beat the deal! According to the sales representative at Sig they are getting overwhelmed with orders so my guess is delivery may be slow?
My SB15 came in today. I was glad I ordered this when I opened the box and saw the free bag. I'm actually more excited about the bag than the brace! If they are still offering the free bag I recommend anyone thinking about the SB15 to get your order in, this was a great deal! If anyone is interested I'll post some pictures of the bag (everyone knows what the brace is).