A little more detail? (I'm assuming this is the ASR). So your bolt handle works? and when you pull it back the sear isn't engaging the piston? What parts have you upgraded inside the bolt?
Edit: The reason I ask, when I installed my 210 spring that last 1/4" was really hard to get used to initially. So what spring did you put in?
Also, a lot of times I forget to put the spring guide retainer back up (not sure what this is called exactly, the part you pull down in the trigger set to remove the bolt), so if there is not spring tension even, that is probably the problem.
Edit: The reason I ask, when I installed my 210 spring that last 1/4" was really hard to get used to initially. So what spring did you put in?
Also, a lot of times I forget to put the spring guide retainer back up (not sure what this is called exactly, the part you pull down in the trigger set to remove the bolt), so if there is not spring tension even, that is probably the problem.