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may have possibly figured out the problem by accident.
tonight I decided to install a non ported cylinder I picked up Monday as I've been using a 509mm TB in my M4. I also went ahead a rewired it as the old wire was frayed and I changed from a full stock to a collapsible and wanted to eliminate the connector.
when closing it up I noticed I bent the trigger spring by pushing it down to hard. figured it wouldn't cause a problem. threw a screw into hold it all in place and tested the trigger and I ended up with the same clicking on semi. since, that spring was the only anomaly I swapped it out, sadly with an mp5 spring which is significantly stiffer. slapped it all back together and what do you know? fires perfectly. So when I muster up the will to deal with the budget build, I'll post back.
Cliff notes: Don't bend down your trigger spring when you install it!
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