Only about 15 days or so. My 21-4 .44 SPL was shooting way high, about a foot at 15 yards. Someone mentioned that some early ones were sighted wrong so I called S&W and quickly had a return authorization number soon followed by a pre-paid Fed Ex ticket. Shipped it off and got it back yesterday, free of charge with a note they had replaced the front sight. I wish I had measured the height of the front sight before I sent it in; I cannot tell for sure anything has been done but I'll take them at their word. off to the range this weekend!