Can seals on multi-pump air rifles get damaged in shipping

Wondering if I am just unlucky have purchased 2 multi-pump air rifles a Crosman 140 and a 1970 model 760. Both of them were supposed to be in working condition but arrived with no compression and air pissing out when trying to pump them. I noticed lots of oils gathering in the loading chamber which gave me the thought that oils may of gotten into places they should not be in from moving around during shipping. I have not had any issues with break barrels or pistols so far. Maybe multi-pump pneumatic air rifles should not be oiled up before shipping or just a string of bad luck. Any thoughts would be appreciated.
 
Things being what they are nowadays whose to say that "Quality Control" or the lack there off is willing to ship out. I haven't shot a multi pump since I was a kid but I'd have to say that unless the guns were old or at the very least under pressure while en route, I just can't see how a perfectly new O' ring would fail under zero stress. True, shippers can also wreck things rather fast, but their damage is either blatantly apparent or non at all. There is no way for the shippers to mess with the seals and their inherent locations without messing with the rest of the gun.

Now, even on very high end rifles, and I mean the "best of the best" rifles, seals fail all the time after being pressurized by the end user. Would you believe me if I told you that even Lothar Walther barrels are expected to have a percentage of duds? Also, sometimes depending on the application, seals can get damaged during assembly and not be noticed due to the fact once things go together they can't be seen unless tested. More and more companies are willing to play the return game instead of incurring the costs of setting up a quality assurance department. It's all a law of averages, and in this modern world unfortunately, it is the consumer whom has become the beta tester. Roll the dice, for a third time?..
 
These seem like they are vintage? If so, where did you get them? Working order means different things to different people, but holds air and shoots is more specific. Older guns may have sat around unpressurized, increasing the chance of dirt and debris getting into the works. I always store mine with a pump or two just to keep the valve closed. They may just need a good cleaning and possibly new seals.
 
Yes they are old the 760 is from 1970 and the 140 is probably 80s but I think you guys hit the nail on the head they probably did not give it a pump or 2 before shipping and the oils got into the seals. I got them both on eBay and both sellers say they were just shooting them recently and they were working great. I worked out a deal with the seller of the 760 for a partial refund so once I knew I owned it I tried an alcohol flush earlier today and it actually seemed to do the job for now. First time trying it was very simple thank you YouTube. Probably won’t last long but just happy to be able to have some fun with it for now.

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