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Never installed mine - Switchback is exactly what I want, aside from a quibble here or there that's not worth noting regarding what would be my ideal. I ought to sell it, but I'll hang on to it a while longer. I think it's too small and the Manticore is nicely sized and folds away to not be clunky, while the Corvus folds up or down, which really isn't any benefit I can determine beyond not poking you directly should you rub up against it. I heard the install can be a pain and, IIRC, there were springs and washers to lose in the process.
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For me the Corvus charging handle took all of about 5 minutes to install.
I like it a lot.
I also have the switchback on another AuG. The switchback wins at being compact, and folds out of the way, and is well built. The Corvus wins in having no rattle, still maintains the fed assist capability, and is solid.
My honest opinion, you cant go wrong with either.