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pretty sure Joe @ UA told me the cracks in his frame were from using the CQB bolt kit (until they changed the spring, apparently newer versions have a stronger recoil spring to alleviate this) because it was redirecting more gas into the recoil. the NPAS isn't going to function the same, its only shutting off the gas flow to the barrel early "not redirecting the excess", once the bolt cycles back (with the same amount of pressure) it will disengage the outflow valve on the mag
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