I did some research, and an o-ring dealer rated Buna o-rings at 5 to 15 years, depending on various factors like usage and quality. I have had some trouble here in Montana in the winter, because Buna is rated down to -10F, and my rifle has seen colder weather than that. A hair dryer or radiant heater and several hours of heat soak along with a shot of Napier Power Airgun Oil stopped the slow leak in my BSA Lonestar .25. I seriously doubt the Brits designed my air rifle for Montana winter temps because it never gets that cold in the UK. My rifle is 10 years old and never had a leak in hot weather, where it is used the most at PD towns.
UV light is death on o-rings, but that shouldn't be a factor in air rifles. O-rings can die a faster death in storage than in an air rifle, if they are exposed to UV light.
UV light is death on o-rings, but that shouldn't be a factor in air rifles. O-rings can die a faster death in storage than in an air rifle, if they are exposed to UV light.
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