Picked up a Detroit PD S&W M&P 40 from Aimsurplus on a whim because I like former LE guns. The one I received for $320 was in excellent condition and came with the original box, 2 more backstraps and one magazine. It is marked "Detroit PD"on the top of the slide and "DPD1240" on the side of the slide and the barrel. They have spare mags for like $14 as well I never had much interest in the M&P and in fact this if the first one I have held. I didn't care for the look of the gun but it sure does feel good in the hand. I am very happy with the purchase. There are some curious dimples on the underside of the slide that I am unsure of the reason that they are there. Pics to follow.