"Best" can mean a lot of things, depending on who you ask. For me, the best AEG of anything, is the one with good externals and TM compatible internals.
Every AEG I own has been opened at least once. Everything that can be tuned for max performance was tuned. Everything that was lacking was replaced.
This is why, if you ask me what is the best MP5, I'll answer Classic Army (with a metal body) if you can find it in rebate, or a Cyma NON-blowback.
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