Recoil spring

Rufus... did you count the coils? Not trying to argue with you just curious. If the spring actually has more coils and is the same gauge wire you might have a mix up. If so it could lead to spring stack if there is not enough room and damage your bolt. The spring creates a solid column that stops the bolt before it should. This has happened a few times with aftermarket springs but not Hi-point as far as I know. I have had mix ups with springs from hi-point. They typically get it right but sometimes a wrong one sneaks in. Once they sent me a stallard JS9 spring for the C9 and It created this situation. I caught it early but it did damage the slide.

I think Moona11 might be referring to spring set. Even a new spring will become shorter after a while once installed. What I am trying to say is that the overall length of a virgin spring is not really a great way to determine strength or wear sometimes. Typically you gauge it by where/how far your brass is landing. There are three springs that can effect ejection on the Hi-point design but the recoil is the main one.