Downside to a sniper rifle is that it cannot be silenced. A high damage laser rifle that is best used as a sniper rifle or semi-automatic due to it’s perk of dealing 2x damage to full health targets. Old Faithful* – An instigating laser gun sold in the Diamond City Markets for a fair price.No real downsides to this gun aside from the fact that it should be modded with a non-automatic and sights. Two-shot is one of the best legendary mods in the game.