Does anyone own one of these that can help. A friend has one and needs extra mags for it but doesn't know which magazines it accepts. The only markings on it are Kel Tec CNC SLC-9. Should I assume it is the standard model and accepts Glock 17 mags or is there a way to tell by looking at it. no one we know owns a Glock so can't borrow a mag and try it.