Beautiful airgun! Love the red color.
When I fired the rifle, air leaked from this area. Which O-rings should I replace? What is the size?
THIS PIN. Yo!
Go shine a light and see if that barrel breech o ring is still there. If it's still there then nothing to do you're all fine. The puff of air coming up with the pin I photoed is NORMAL no problem probably that tiny o ring under not seated fully but not necessary to take anything apart it's fine and normal a puff of air from that place. Here's what I found while searching 30+ PAGES! DAYSTATE REPORT! 5mm id x 8mm od x 1.5mm c/s whatever that means and 75 Durometer rubber Viton I rings. I HOPE ITS THE RIGHT SIZE!!! Yo!