I stopped in a LGS that normally has a few Glock parts in their parts cabinets to pick up a smooth trigger for my G30. The fellow that works on the firearms says I need a trigger from a G21 becauses the trigger bar is designed around the caliber. He dosen't have a G21 trigger but can order one for me. I told him to wait, I needed to verify a couple things and left. Can I install a G17 trigger in my G30, not SF, or do I need to get a G21 trigger ?