if you are good, then you can do this with a outlaw/FS Spear, and do it with better aim assist and better scopes.
Lets get the nerf stick out for Spears while we are at it?
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No you can't: Outlaw only triggers on precision [i]kills[/i], so you'd have to have already killed the boss to get a fast reload from it.
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You can easily do it with spray and play + special weapon gauntlets.