Welcome to the FTF community.
I'm sure someone more knowledgeable about Glocks than me will be along soon to answer your questions.
When you have a chance, please go to the Introduction forum and introduce yourself to the folks.
“If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen.” ― Samuel Adams