durability is good on the cyma cm028 and cm031 because they have solid construction and v.3 gearbox which allows it to be upgraded easily,good stock performance and because they are marui compatitle many after market metal parts and stocks fit.
as for the mp5s and m16 they have v.2 gearbox which isnt a problem, but v.3 is just better upgradable in long run and there are also after market parts for them.
and mp5 and m16s mounting sights is easier than on the ak series.
in my opinion cyma cm028 or cm031 are the best from those.


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