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One of the sweetest SIG 552s I've worked on (ok, the only one, but of all the AEGs I've dealt with over the years), was the TM one, I upgraded it with a Modify 100 spring, bearing spring guide and 6.03mm tightbore, it shot around 360fps and was a freaking tackdriver, seriously full mags on full auto would net 2" groups at 30ft (which is amazing for any AEG).
I'm a purist, go for the TM.
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