Picked up my new M&P 15-22 from my LGS the other day. Had to get the compliant fixed stock model as I live in CT. Gave me one in a factory taped box. Also bought 2 of the short 10 round magazines to go with it. Opened the box and it had one of the long 10 round marked magazines in it but noticed there was no pull down button on it. I figured someone at the factory forgot to put it on so I e-mailed S&W customer service to see if they would send me one. Got a reply from S&W stating that the compliant magazines do not come with the buttons. Found this strange as the 2 short 10 round magazines have them.