Glock 19 gen 5 that's been modified

Radian Ramjet barrel and Afterburner comp
Radian Guardian optic plate and Radian Six sights
Trijicon RMR Type 2 adjustable
Surefire X300 Ultra A
Centennial Defense pin and takedown lever kit
Vickers Tactical extended slide stop/slide release
Overwatch Precision Half Blue magwell

Polished all the internals which are OEM and I utilize OEM magazines.

Aftermarket magazine extensions I recommend are
Shield Arms
Killer Innovations
Arc Division
Tyrant Designs CNC
Warne
And yes, even the Strike Industries polymer and aluminum magazine extensions are decent.