With the L class, the best way to get attack is to use either the dual 6" or the single 7.5".
When you can, try to buy yourself an Emerald (does not require BO classing, just when you hit about lvl 26ish hit "buy" it will pop up), and load it with 4" duals till you unlock the single 7.5" (best anti-ship setup on emerald). However if you are playing mostly GBII then put on some AA guns
Also i highly recommend you read "nf-guides.com" and "trainworld.us"
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