Supposedly, the "no lead" warning for these pistols is due to the square-cut rifling Glock uses, which is supposed to be susceptible to leading.
Are you sure?
Glock on the right!
I think Glock is concerned because polygonal rifling and lead is an unknown. They have no dog in making it work. If Glock made lead bullets, you can be damn sure it would work with polygonal rifling!