New G21 SF ambi mag release button Using new OE Glock supplied hicap mags when actuating on a full loaded mag (when dropping a full mag), the button overextends, and sticks in the open position. Must push back the button to zero position, or it will not catch the next inserted mag. Happens in both directions. Seems to improve as mag empties, at -3 rounds it starts to go away. -4/-5 symptom gone. Do I need to send this back? Can I fix this myself?