Some time ago I purchased a 3906 off from a member here. I don't recall who that was. I love the single stack S&W 9mm's. I have 1st, 2nd and 3rd generations. I have a question on my 3906. From everything I have read and pictures I have seen, the 3906 all have the square trigger guard. Mine doesn't. It is rounded. I know it is possible that this was done after manufacture, but how do I tell, for sure? If it was done after manufacture, who ever did it did an excellent job. Yes, I could call S&W, but perhaps someone here knows. I would add pictures but I'm too naive to do so. The serial number begins with TDL. The gun is also a decocker only. I'm sure that this was probably done after manufacture unless it was an LE order. Thanks.