Small increase? It goes from firing 1 ever 3 combat rounds to firing in 2/3's of the combat rounds. It's a double!
Rosrow: you're missing his distinction between a semicolon ( and a comma (,); he is using the semicolon to distinguish between combat rounds, and the comma to distinguish between quickness actions.
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Of course, by the time I finish this post, it will already be obsolete. C'est la vie.