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."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)