Things I liked:This is as close as you can get to the real thing in terms of weight, look, and balance. Lay it next to my real M&P and it is dead on unless you look from the rear Things I would have changed:Make the safety designed by S&W function rather then designing your own so this can be used for actual perfect practice What others should know:The blowback is "interesting" but isn't all that realistic since the real weapon's kick is so much greater I would save the CO2 for more shots. I can't praise this enough it is a great way to practice daily skills without any concern for range time or cost of ammunition. Well done weapon and priced to be the perfect practice gun. Accuracy like any other blowback is OK and more then enough to simulate real world use. I have easily 3K rounds through mine with no real complaints short of the desire to redesign the safety to something more functional. Mine is finally showing wear and tear on the black. A drop out mag would be asking for the moon at this price but the round mags are cheap, easy to use, and fit lots of models besides this one. It IS BTW single or double unlike the company's direction just pull the slide back and done.