u/Equivalent-Donkey987

I'm a complete noob, I know nothing about this game or its franchise, but I'm really enjoying it and probably will end up becoming a fan.

I would like to ask for help regarding the "loot boxes". I hate this stuff, but it is a common thing on modern gaming so we must go along with it. At first I completely ignored it but I've heard that you can earn them without spending more money and it is possible to get the HK416 from the boxes

Can someone explain how it works and how can I get the HK416 in a complete noob way?

I'm tired of being at a disadvantage. Every player I kill or kills me are full T5 gear and ammo with a 650-700k weapon (disassembled weapons to fill the entry budget), some guys I killed didnt even had a backpack. From what I understood, T1 to T4 is competely obsolete on lockdown.

Can someone please recommend me a T5 loadout to start off? Do I go for cheapest T5 armor or is that a bad idea?