I personnally bought a G&G M16, Advanced version (seems to be tuned by TOPTECH).
Changed the spring, it now shoots 393 fps, everything else is stock parts. I love it!! Gamed it twice, works great!!! One negative point, the mag is loose in the lower smoke receiver, so I had to put on some tape on the mags to push them towards the barrel, to ensure the mags feeds correctly. I'll put a permanent shim into the lower this week, to solve the problem.
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