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Message: <blockquote data-quote="uncle money bags" data-source="post: 2310736" data-attributes="member: 8377">THat is some solid advice. Do not rely on whatever is marked on the barrel, unless it is from a manufacturer that adheres to strict quality control methods and procedures. If you have verified the chamber as 5.56 the next step is incrementally increasing charge weights while looking for signs of overpressure. If you dont already see ejector smearing then you soon will but that is somewhat normal for spec pressure 5.56 loads. Combine that with split necks and popped or cratered primers and you will know you are probably at the limits of reliability and safety. Just be methodical and patient.</blockquote>