If I were building a 10.3 w/ adj gblock, I'd tune the gas to run on an h2 sprinco blue or a5h2 sprinco green.
I would also suggest extractor insert with either sprinco 5 coil, bcm enhanced, or colt gold springs. The bcm or sprinco 100% do not need an o ring, never had a colt, so I can't say.
If you get the gas down extractor tension isn't as big of a deal.


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