I just read this thread for the first time. You have a chamber issue like IraqGunz (blessed be his name) first said was most concerning to him. This is shown because you have effectively fixed the the over gassing issue yet you are still popping primers with a known high pressure ammo 556 ammo. Is this barrel 556 chamber or Noveske Match Mod 0 (that is CHF vs Stainless)? Noveske’s NMM0 chamber is similar to .223 Wylde.
Short stroking is not weird if the chamber is tight, too much friction to pull the case out of the tight chamber which you are now experiencing because you got Noveske’s giant blow hole gas port dialed back with the AdJ gas block and LMT e carrier and it is not driving the bolt back as hard as a result.
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