I have concluded that I am NOT a fan of this feature. Being able to see the amount of ammo in your magazine every time you reload is a step backwards from the minimalistic and authentic HUD in Insurgency2014. That was one of the core features of Insurgency2014 that made it unique from other shooters.
Everyone having such limited information through the HUD leads to immersive, tense gameplay, and you are punished if you don't keep count of your current ammo count because you may find you only have 5 bullets in a mag. Brutal and authentic.
I want the bullets in the magazine count to be removed when reloading, but the feature to check ammo through holding the F key should be expanded upon, and give you all the details of your ammo count when activated.