I would like to suggest Armor piercing rounds
New bullet type for Behemoth and C-Tac snipers.
Instead of extended mag, you would have the option for armor piercing rounds that deal decent damage to armored vehicles like the APC, Anti-Air Tank, and Tank. The damage wont be anywhere near rpg or c4 damage, of course there will be a minor drawback as well. Weapons using armor piercing will hold less ammo in the mags, and less ammo altogether