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Mechanical Alliance Soundwave is good, aside from a lack of a tab on the gun to plug it into the hand. It's had 2 extra runs which failed to fix that. The alt mode is questionable but Hasbro's pancake is worse.
It comes with Ravage. The United scout class Rumble & Frenzy work well with it aesthetically. Laserbeak & Buzzsaw have few options, the Perfect Effect versions are okay enough to match it.