All pulse rifles have Overpenetration when shooting through the Dark Shields of Knights (AKA "Dark Breaker" Skill). This is suspected by me and my friends to be an 'early release' glitch of the bonus from the Legendary Crota's End Raid Pulse Rifle known as Oversoul Edict ( http://www.destinydb.com/items/868574327-oversoul-edict ) somehow being applied to all pulse rifles.
Tl;Dr: somehow the bonus for Oversoul Edict is applying to all Pulse Rifles.
Edit: Confirmed applying to all machine guns too.
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Confirmed that Machine Guns also have this glitch. This means the "Dark Breaker" perk is currently affecting all Pulse Rifles and Machine Guns.