I thought mine was the old one. However it wasn't. It was actually gold in color. Just because the bolt was badly oxidized that it looked silverish in color.

The one that I bought from Fastlane, which is currently in the Injection Pump, is gold in color.

I looked at both of 'em carefully. The old one was actually almost 1mm shorter. Maybe the spring was actually weaker too. I never thought it was a spring inside.... I thought it was a solid bolt.