If you talking about duration that's mk 44 stand asides. I don't remember shoulder charge getting a damage nerf which is all the grieves gives. Your video is poor showcase of the greaves doing extra damage, the mk44 will do you more justice my friend.
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wasnt about damage, the speed nerf and tracking nerf on the shoulder charge got nerfed, wearing peregrine negates those nerfs and restores it to its unerfed form
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They boots don't fix tracking. Shoulder charge tracks as is with little thumbskill