Striker O-ring

[raven14]

Got a MR-1 mechanical. Been playing with it for a little while with no problems. Took the marker apart for a good cleaning. When I removed the striker I noticed there was no o-ring on it at all. From what I understand there should be a reddish/orange o-ring on the the striker, right? If so, why is my marker not leaking air like crazy. I put the marker back together and aired up and there seems to be no problems. Am I missing something here?