1. have an item in your hand (in my case, canteen)
2. hit spacebar to get into the raised position
3. hold W to move forward, while simultaneously hitting a bound item (in my case, bandage)
4. your character will stop to take out the second item
now repeat step 1 but make sure the item is a firearm (in my case, SKS) and go through 2-4, notice that your character doesn't stop when you swap to the other item in step 3
to be honest i just want it to be consistent as i have no preference