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I believe the graphite is there for some form of supposed lubrication purpose,
as I have seen graphite used to lubricate the inside of a lock, Im assuming its graphite covered BB's are supposed to somewhat lube up the inside of a barrel when firing, however with that theres also a build of of the graphite as well and once it al gunks up, thats no good.
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"Its only a little bit on fire"
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