Copper can be poisonous in LARGE amounts a little BB is not going to kill you, however I wouldn't remove it yourself, you can give yourself a staff infection which would not be good! Staff infection shmaff infection.
Likewise, what is the difference between copper and steel BBs? Copper BB's in my optioning can corrode over time and create a rust like looking dust which can get in your Airgun. Steel BB's will rebound off of hard objects much easier potentially hitting the shooter. BB's do not work well in rifled barrels and can wear down the barrels.
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