Just to throw a wrench into the works here, but the spring guide has a ball in to to lock into the buffer cap. The tension on this ball is adjustable. The results of the testing could be nothing more than a difference in tension between spring guide bearing locks.
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Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.
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