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I'm building my recently anodized 80% lower and mating it up to a M4 Enhanced upper from Aero Precision. I'm running into a couple problems. First, the build.

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Lower went together okay. The issue I ran into was that I put the barrel in and it has a little retaining ball on it and I can't get it out of the upper. It seems to be attached to the BCG. Any ideas on how to remove it?
 
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Well, made a tactical error. For my builds I bought .223 and .308 headspace tools. Turns out that I bought a 5.56 barrel (original plan was a Wylde). So the bolt closed on the NOGO gauge but it is a false positive since the .223 gauge is smaller than the 5.56.

GO:

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NOGO

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Had me worried for a moment.
 
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So until I get my gauges it is all dry fit, but not looking too bad.

Most of it is Aero and Magpul. Holographic is a EO Tech. 1/7 twist 16in Carbine length barrel and a VG6 flash hider. Didn't go for the adjustable gas block. Figured I'd play around with it as is first to determine if that is necessary.

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I went out to test it today. Initially it shot well. I was able to empty my standard sized 30 round mag with no issues. However after 60 some rounds the trigger started to failed to reset. I could manually cycle it and it would work. Followup shots would fail to reset again.

My buddy noticed that if he wiggled the safety lever a small amount the trigger would reset. Any thoughts?
 

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