It's been to a swap-out-parts place.
The extended slide stop.
That would lead me to believe that there is a possibility that other "improvements" may have been made.
Thoroughly check the thing out for "fool-tool" marks.
We have a sticky that you should read.
(But I'm glad you are starting to go away from Glocks.)
"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)