Richard,
Welcome to the forum.
i have stainless 24/7 in .40 S&W and a 9mm long slide. purchased both guns, new, within the past 4-6 months the mags for the .40 won't hold more than 14 rounds, and they don't fit flush with the bottom of the mag well. gun shoots fine, but the mags are not "right."
9mm also shoots very nicely, but all three mags i own (2 came with gun, i added the 3rd at time of purchase) have the same "do not fit flush with the bottom of the grip/mag well." i suspect you guy have new mags that have eliminated these problems. i don't wan't to send in gun---takes too long. can you help me?