Breech O-Ring

Thank you Hoople. I was beginning to feel very unpopular. I am sure others that have .177's have replaced their breach o-ring. 

What made me question this was a phone call to a Daystate.I needed to order a few O-rings for my Wolverine in 177. I was told I needed the 4x1.5 and before I got off the phone I asked, Will these O-rings also fit my Huntsman. The reply was 177 is 177. I said oh. I didn't ask any other questions but later I realized I had seen posts of a variety or sizes used on different .177's. From your post I was thinking, Oh there must be different amounts of compression since .177 is about 4.5mm. Thinking about this I now realize the O-ring dosnt seal on the pellet but the probe. Thanks for helping