Brass is hitting the slide on ejection.
How many rounds has been through it so far?
Get a new recoil spring and compare lengths. If the old is 1" or more shorter than the new, it is time to change it.
"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)