Pardini bolt o-rings

First topic message reminder :

Anybody know what size these really are?  From measuring in inches and converting to mm the best i've come up with is 1.9mm CS X 2.1mm

Scott

I asked Pardini about these O-Rings. All they would tell me was "they are Metric."

Thanks to forum member Gravy posting about this part number, I ordered these from Mc Master Carr:

Mc Master Carr O rings:
Part number 5308T113, Buna-N, Durometer Hardness (90A), 0.07” Width, 0.070” ID, 0.201” OD

I replaced my factory O rings after 15 K rounds (22 LR) and it's been running fine after a 200 round test-100% function. The old factory O rings were done, I think I should have replaced them at 10K based on what I found at 15K rounds.

Gravy provided the info in this forum post:
https://www.bullseyeforum.net/t14472-the-annals-of-troubleshooting-a-pardini-sp-be-22