Well, after messing with it all weekend, I can now get the hold open to engage sporadically. The HO definitely needed fitting and now moves with ease. I think it's most likely a worn magazine release button as Ron had said but not 100% sure. It does engage when the mag is pushed up tight and the release button is slightly worn. What I did notice is that the HO spring is coming in contact with the barrel assem. when reassembled. I don't know if this correct as it seems it's putting additional downward pressure on the HO spring. Anyway, closer than I was with everyone's assistance.
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