Guys, I have a 4.0 Tactical STI in 9mm. I have a GemTech Multimount as well. I want to rebarrel my STI for the suppressor, so what type of barrel works better with the weight of a can on the end? Do I go to a bushing type barrel or stay with an extended bull barrel? Do I need to use my LID with it or is it unnessary?