Sniper mastery

Your years of training has given you an immense knowledge and skill in ranged weaponry, even if your melee combat skill has atrophied

You no longer roll with disadvantage when you are targeting someone in the long range of the weapon, and while shooting within the short range of your weapon you can ignore half and three quarters cover. 

You roll with disadvantage when making a ranged weapon attack or casting a spell while in an enemy’s melee range, and you lose proficiency with shields and all heavy and two handed melee weapons that you had before taking this feat.