Ar-15 failure to eject resolves with polymer mag????

It will have to wait a couple months before I buy another barrel unfortunately. I just ordered a saiga 7.62 to convert so I can't afford to throw another2-300 bucks away. Any opinions on a decent barrel for the money? I heard good things about palmetto state arms cold hammer forged barrels but they only sell them on complete uppers although 500 for a complete upper is not a bad deal I just can't do it now. Thanks guys for all the help I never thought of it being overgassed!
 
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