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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Edited by Oracle: 11/23/2014 1:09:21 AMDamn that perk tree is sexy, even with the low impact. Might make me give pulse rifles a try once it comes out.