I purchased four new 2011 mags in 9mm for my Marauder last week. On my first trip to the range, the mags would not engage the slide stop so there was no lock back. These new mags were the stainless models. The mags that came with the pistol in the Xylon finished have worked flawlessly since I got the gun about 3 weeks ago.
Anything I can do on my end to make his work?