For the M4 platform I can give the following opinions:
The stock open bolt system is MUCH more accurate than a stock closed bolt system, or Falcon upgrade.
I've been using the stock trigger box for almost 2 years now over numerous games, and last spring I switched to an open bolt kit using the old trigger box. It's well worn, but it still works. I've probably put in around 3000 rounds or so.
Mags tend to leak, but not as nearly as difficult to fix compared to WA mags.
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Weee!
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