I purchased a gen 4 glock 19 yesterday. Very happy with the pistol but like the gen 3 trigger better of my other glocks. Where can I purchase a gen 3 trigger bar. I want to make sure I don't order the one with the bump on it like the gen 4. I have heard that some of the gen 3 our coming with gen 4 trigger bar I want to make sure this is a gen 3 part. Thanks in advance!