Originally Posted by
Gio
Honestly you really don't need much.
Need:
OEM Extended Mag Catch
Sights (I prefer TTI or Dawson, F/O front with black rear)
Grip plug that is blended enough to make a ramp
Mag extensions for carry optics - I haven't tried the magpul 21 round mags, but I've got Dawson +5/6 extensions that work well
Preference:
4.5-5.0# Striker Spring
Minus Connector
Aftermarket guide rod (stainless steel or tungsten) with 14-15# spring. Make sure it passes the vertical slide return to battery test (hold the trigger to the rear, cycle the slide, and slowly guide it back into battery with the gun pointed up at the ceiling). My gen4 and 5's do not with a 13# or less recoil spring and a 5.0# striker spring.
If you do much else you really start to risk reliability.