Just picked up my Lar-9 complete lower from GC today. Great transaction by the way.Got it home and found that the mag catch is not engaging the mags I am using so they fall out. I have tried several brands of mags with no success. Got RRA to send me another mag catch but thinking that might not be it. I am relatively new to the AR platform so this might be simple, I don't know. Can this be tweeked or fixed easily or is it more complex than my knowledge? Anyone ever have this problem and how the heck did ya fix it. Thanks all will check comment and reply after class tonight. I know there are several AR guru's here so please help, I need to shoot this weekend it's been to long.