As seller, you should advise the buyer of any known defect with a firearm. I would hate to have something happen to the buyer.
It could open a bucket of worms for you.
By the way, check into our "Introductions" area.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
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Life Member NAHC