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BTW...I bought some black hopup rubbers (new type) and a stainless steel tightbore barrel (comes with black hopup rubber). The nub of the black rubber protrudes nicely into the stainless barrel...but protrudes too much into the stock brass barrel.
A fix for this is to file/cut/shave down the black rubber nub when using it on a stock brass barrel.
It's not a matter of the ball bearing being too big or anything like that...it's just that the hopup rubber nub is long.
Tys
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