@Joshua_Canaanite AP ammo on anything except LMGs and the NTW-50 is almost pointless, snipers being able to damage him changes nothing.
AP ammo has all the worst characteristics of every ammo type for a gun, combined - lowest possible magazine size, projectile velocity that is around if not slower than CQ ammo, damage that is around or less than HP ammo at close range and CQ ammo at long range, fire rate on par with HP ammo, and on most non-season guns it has very few spare magazines. It is so bad, for a while you could NOT one shot headshot kill someone with AP ammo with the GVT at range if they had armor (when it also affected the head), and I believe you still can not with the XCE Bar with the heavy suppressor that reduces velocity more than damage.
It is guaranteed you are not 1 shot headshotting him at range if you deal 45% less damage, even without any suppressors. And the bodyshots? Sniper rifle headshots do 4x damage. That is to say, AP bodyshot damage can go below 25.
Only LMGs have enough ammo in the magazine for all those downsides to not be an issue, as often their HP ammo firerate and damage isn't as bad as it is on assault rifles, making running AP ammo with them actually plausible. And the AK 5C is one exception for the rest. But then, why even use it? You're still lowering your infantry damage over the chance that... You can deal ~10 damage to a tank if you spam your entire mag at it from long range, and you die? You can shoot the one dozer you may or may not come across?
I think it goes without saying, but, you're not sniping anyone with the NTW-50.