Like many of you ,I have been searching the web for M&P15-22. I have seen two different models on this gun. One with out a compensator and one with. So I called S&W to ask what was going on with this line. I was told that one without compensator is only one available for now. Was told that the compensator model will be out this October and that the new line of M&P15-22"s will be out Feb 2010. Hope this will help others seeing the same as I did.