Originally Posted by MrVvrroomm
Does your 21sf by chance have a Picatinny rail and ambidextrous mag catch?
No and thank goodness cause I already went through that fiasco! hah... but all of my mags are metal lined and only one is from another place. I went shooting with a buddy the other day and think that I may have grabbed one of his mags by chance. I will get my mags back from him and check again but this problem only showed up since we went shooting. Thanks for the replies.