Glitching Playermodel/Bugs

Sometimes when you Aim with a gun with thermal sights attached to it or in general with a gun, or hold it, the gun buggs around and theres something black infront your view fast, which goes away fast again. this repeats sometimes.

Sometimes when the player reaches for ammo, he picks 2 and the magazine has a bugged gesture in the hand. The other magazine falls to the floor and the player cant pick it up mostly.

Doors are too tiny for big people, the hitbox of entering doors should be the same.