I own two WE m9's which are effectively identical.
First off I'm curious if you fixed the problem with the sticky blowback assembly as i am experiencing the same problems in both mine. Secondly if you haven't figured it out already there is a hop up adjust, you just need to field strip, then remove the innerbarrel/hop assembly from the outer barrel, and once you do that you will see a small flat head screw on top of the inner barrel / hop up frame. Tighten or loosen that screw. The screw loosened off on one of mine and thus i effectively had no hop up whatsoever and bb's would fall like rocks.
Am really trying hard to figure out how to get the blowback assembly to move more cleanly, dunno why its so damn sticky n designed with so much friction.
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