Gun slinger

Trained to shoot and are extremely deadly usually use pistols and rifles 

hold breath

the user holds there breath to steady there aim with a rifle or similar weapon gaining advantage on dc rolls

Hunting dog

Choose a small to medium-sized four leged mammalian animal to fight alongside you

silencer

all (gun)weapons now have the ability to roll dc at disadvantage to avoid detection if the attack fails you will be detected 

hold position

non-rifle attacks get a +4 to damage and roll with advantage for dc if the user has not moved position this turn