i have a gen 4 glock 19, about 500 rounds, maybe 6 months old. Ive started noticing when inserting the magazines the click is not as prominent as it was sometimes its very faint. Does it with all my glock 19 magazines except the pmag i have. All mags were bought around the same time i bought the gun. It shoots fine and the mags stay in the gun i was just wondering if this is normal? My 43 doesnt do this.