I've used my GLock 21 many times in both Limited and CDP...
Novak makes a nice Novak Wide Notch rear site, and I have a TruGlo TFO green front sight, and an OEM 3.5 connector...
My Limited mags, 3 of my mags have Arrendondo +4 extensions, for a 17+1 capacity...
The rest...unfortunately... is up to me!