I have a Rem 700 BDL long action with the new J-Lock feature on the bolt shroud. I was told that I had to get after market shroud in order to have trigger work done. Is this correct? When I was told this, I thought that I could just get older style bolt assembly but I was told this would change the head space. Is this true? From what I understand I don't believe either is true but thought maybe someone that does smith work could shed some light. Thanks for any help.