Commando Droid

Sneak Attack. The commando droid deals an extra 7 (2d6) damage when it hits a target with a weapon attack and has advantage on the attack roll, or when the target is within 5 feet of an ally of the commando droid that isn't incapacitated and the commando droid doesn't have disadvantage on the attack roll.

Multiattack. The commando droid makes two vibrosword attacks.

Vibrosword. Melee Weapon Attack: 5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) piercing damage. 

Heavy Blaster. RangedWeapon Attack: +5 to hit, range 30/120 ft., one target. Hit: 18 (3d6 + 3) piercing damage.

Uncanny Dodge. When an attacker the commando droid can see hits it with an attack, the commando droid can halve the damage against it.