So, the situation came up with an RZ-2. It's firing arc was pointed backwards and it used Snap Shot to attack a ship after that ship executed a maneuver. In the engagement phase, my opponent wanted to know if he could use Snap Shot as his normal attack. For reference:
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"After an enemy ship executes a maneuver, you may perform this attack against it as a bonus attack."
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It looks like it's only a bonus attack when you're using it after a ship executes a maneuver, so the answer would be yes, but that might be completely wrong.