tight is an understatement
Two hopup rubbers...near identical but the thickness of the lips on one were a smidge thicker than another. 100% jams with the thicker one...perfect feeding with the other.
You can test "feed" before you reassemble by just placing a BB on the lips when it's all assembled and gently pushing it a touch with a stick/rod/etc...it should pass nicely. If it needs to be forced through...it'll probably jam.
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