I see a lot of hate going on GT. So if you have a G4 speak up tell us your story. This is my 19 G4 That's only 4 weeks old and have had over 600 round with no issues what so ever came with the 0-3 spring and now have the 0-4 that Glock sent me. I Could not be happier. I think Glock made a great improvement over the GEN3 Witch i did have and don't miss.