As I stated in a response to your other post, Gen 1, NFML Glock mags usually require some factory modification to the grip. I don't know the specifics but believe it has something to do with the mag catch.
nfml gen 1 mags are very slightly shorter so the mag floor plate may contate the bottom of the mag well ever so slightly in my experience a firm tap os all that is required to seat them adequately. If this does not work for your sub try using fine grit sandpaper to polish the magwell so to speak.
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