I bought a used scar-l from the forum and its been more than I could have asked for in my first gun.
I can't speak for the m4 but my scar-l shoots around ~390fps and has extremely tight grouping and after I got her tuned by a gundoc its ROF is insane on a standard battery.
I haven't done anything but put in a new hop rubber and longer tighter barrel and re-wire to deans.
I don't study RS externals but everyone comments on it and wants to hold it
check with your local field about outdoor fps, mine is comfortable in our 430 max limit
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