Smith 625 pre-lock circle under cylinder release

[spistols]

Saw a 625 Smith pre-lock and it had some type of circle under the cylinder release. If this circle where on top I would have surmised that someone put a cylinder lock plug in...but it is below the cylinder release.

Any thoughts?

 

[cmshoot]

Got a pic?

 

[spistols]

No pic. Gun show seller did not want pics.

Some people said it is the hammer stud.

 

[cmshoot]

No pic. Gun show seller did not want pics.

Some people said it is the hammer stud.

That’s what it sounds like to me.