For example: knife (when run) and m4a1 (on fight).
Now I use two solution:
1. mouse whell up (previous weapon in options) and click on this and mouse whell down (nextweapon in options) and click on this. This is very slowly.
2. last used weapon (eg. middle mouse button or left shift) to switch two last weapon. Disadventage is change two weapon to switch on start (when I use HE additionali this is bad).
The option "With HUD Fastswitch" it makes no difference.
How many players to do?