re: ***UPDATE NO.3**My new AR is cycling .223 fine but hanging up on 5.56

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Sounds like you are getting frustrated, take it to a local gunsmith and let them check it out for you - you will run in circles trying to stay caught up in a thread..

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Sounds like you are getting frustrated,

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I am. It would be simple if someone would map out a detailed order of events.
1. Buy a headspace gauge (which one exactly)
2. Learn how to use headspace gauge
3. After learning how to use gauge, accumulate info
4. After you have your info, it should tell you this, this, and this.
5. You need to send your upper in after discovering this.

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take it to a local gunsmith and let them check it out for you

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I am trying to avoid this because if I let someone do this for me, then what exactly have I learned? Nothing. I want to try and figure this out, just need a little guidance. Im also a cheap bastard when it comes to paying someone to do something that I feel I can figure out on my own.