Too big, sadly, plus the tail is kind of small. Shame, or else I would have just stuck with my old G1 Snarl.
I'm using the FansToys Stomp for my Sludge, it's still a bit small but it kind of works. Swoop is the real scale-buster though, the only official toy that'd work is the Age of Extinction Strafe which was a super-limited release mini-con, and the only other toy that'd maybe fit is the unofficial World's Smallest Transformers Swoop. And I really like the design of Animated Swoop, as well as the way that using the 'bots I have gives them all different melee weapons, apart from Sludge who gets his rocket launcher instead.
So yeah, it's very much a 'best I can do/rough scale' than 100% accurate, but it still looks cool.