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Ok first of all if your doing an AK build you want a AK that has VFC style construction. Otherwise your front end will keep coming loose(TM style construction).
Depending on which model CYMA(ECHO1 are cyma rebrands) some are TM some are VFC style.
Since your planning on replacing most of the internals anyway I suggest a Dboy/boyi/Kalash full steel AK. The externals are generally much nicer then CYMA Aks.
The caveat on that is that CYMAs have better internals...but you were planning on changeing them anyway.
I also recommend the links XZIVR posted. Those are two solid reputable Canadian parts
suppliers. Stealth(airsoftstore.ca) even tests all the parts he sells!
I wouldn't go with a systema barrel. My two barrel choices that i go with are Prometheus 6.03 Stainless steel for my main guns and madbull 6.03 aluminum.
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