Bungie, WTF are you doing. Black hammer is one of the best sniper rifles in destiny. Now if you going to nerf the white nail perk, it's going to be Garbage. Please leave the black hammer alone!!!
Read the weekly update for more info. https://www.bungie.net/en/News/News?aid=13154
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Will not matter since update is coming in TTK and then you wont be able to upgrade it.