Last Friday I bought an RIA 9mm tactical. It came with one Check-Mate mag and I'm not sure I like it that much. The mag spring seems to have a slight 'bind' in it after about the fifth round is loaded. I got to shoot four rounds through this pistol Saturday between downpours in the backyard and the slide failed to lock open after the last round. I realize it could very well have been a new pistol/mag glitch that never happens again so I'll withhold judgment until I get to shoot it some more. Those of you who have one of these pistols, what magazines do you use?