I have this thing about the extended slide stop. I don't like them.
That is a tip off to me that it was worked on. As others have said, shoot a couple of mags through it.
(And try a couple of HP rounds, too.)
"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)