I’m new to ARs. I have installed a Timney Calvin Elite trigger in my REM 700 5R bolt action. REM 700 triggers are adjustable for pull weight with an adjusting screw. In watching videos of AR triggers it looks like a different setup with the pivoting hammer. Is it possible to adjust trigger pull weight without replacing the trigger springs? Or is that the only method of adjustment? I have a Seekins SP10 with a Timney trigger set from factory at 3 lbs. It’s a single stage trigger and it is crisp. I have my Calvin Elite set at 2.5 lbs and if possible would like the AR10 the same.