I just purchased a Rem 700 5R .308, and it came with a older version of Remington's new X Mark Pro trigger. This one is not externally adjustable. The trigger pull is set at 5.5lbs, and I would like to have a pull around 2.5 to 3 lbs. I have read mixed reviews about the X Mark Pro, and I want to decide between replacing it with a Timney #510 or trying to adjust it. Some review said that they were inconsistant and pull weight change over time.