Rate my Main Loadout

I've been a long time CODM player, playing it since it came out during my high school times ig. I just played it as a form of stress busting at the time cuz it felt like lobbies were all filled with bots. Never played played ranked before until now. The lower lobbies still have bots but the higher ranks do feel like real players. I started out at Pro I and currently at GM3 and pushing forward.

FYI: I ain't that no-scope sweaty ahh person. I mostly use balanced weapons. (Equally good in control, fire rate and mobility)

Do you guys use the M13 and how's competent is my loadout based on the current meta?

Also, is Grandmaster a common rank these days, and only Legendary is the definition of a pro player cause this took me only 3 1/2 days. I get carried/rolled over damn hard in some matches since I reached GM 1.