They have one f/o front sight that will work with a factory rear and should work with the Warren rear, Dawson # 021-035. It's .125 wide and .160 tall, we have the complete line of Dawson M&P sights in stock along with the 10-8 rear sight but I haven't had time to put them on the web site, I'll get that done the first part of the week. Email me if you want one and I'll get you the details. The Warren rear and HiViz fronts should be in this week.