Is the stock BAR-10's spring lower than a 130? And also, what do the numbers mean for the springs? The reason I am asking is because I am thinking about getting a 130 spring but just want to make sure that the stock one isn't a 130.
It refers to metres per second. Easyest is to make spring spacers to change the spring rate. Go look at the Ultimate VSR thread, at the bottom of the my first post is what I use to fine tune/bump my fps