Just decided to replace the pinned MB that has been on my Mini for @ 5 years to expose this->

Dya think this could cause poor accuracy? I've heard many say, or worry that is might... but this mini has shot perfectly all along. Chemicals did not touch this deposit... only by mechanical means was it removed from the muzzle.
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Dya think this could cause poor accuracy? I've heard many say, or worry that is might... but this mini has shot perfectly all along. Chemicals did not touch this deposit... only by mechanical means was it removed from the muzzle.
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