Couger
Cast bullets will work in a Glock barrel. Since they are polygonal rifled, you want to simulate a FMJ bullet. That means a hard cast bullet that is sized about .001 / .002 over bore. People run into problems when they use soft, or undersized bullet that strip on the rifling, and can leave severe leading, raising pressures when hot jacket bullets are then used. I have fired thousands of lead bullets thru my models 19 and 26.
Lone Wolf is a manufacturer that is known for their cut rifled barrels for Glocks. Their barrels offer a fully supported chamber that some find desirable when loading on the hot side, though a buddy of mine has put many rounds thru his Glock 10mm factory barrel that were max loads, without issue.
Larry