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It's possible to put a spring in a TM to get it to 400fps, but the stock internals will eventually fail pulling that spring - it's just too stiff for a gun designed to shoot around 300fps out of the box.
I do have a mostly stock TM M4 with a special spring shooting around 330fps and I can tell you it shoots just as accurately as the wide variety of 400fps VFC guns I've owned with R-Hops and all that jazz.
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