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Buffed greased would suffer from the same issues as normal greased, and it'd be awkward to pull off. You'd need an engineer to buff the gat, then run over to their own gun. It might work on anti-Galleon Pyra builds, but that's about it.And Echo, your argument would be perfectly valid if it wasn't wrong The gun buff lasts 20 seconds. 7.2 second clip, plus a five-second reload. The buff lasts two clips. In addition, the two reloads from those clips add up to 10 seconds. It takes 6 seconds to buff a gun.
To only worry about the gat though is a little short-sighted though. Light flak loaded with heavy is only 3 shots now. Not an instant kill for many boats.