I was using a single shot tray and had a pellet go into where the cocking mechanism is. I took Picatinny rail off to get pellet out. I shook pellet out, but this part came out as well. All of the studs that go to rail are there. What is this part? The gun seems to work, the schematic I found is not of very high quality. 
Tuning Benjamin Caydan Mystery part
- Thread starter JORDAN57
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Well I do have a leak, I blew the oring out of barrel, and
I believe the part came from barrel end
I believe the part came from barrel end
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There was a thread on AGN which provided an exploded view of the gun, and referenced a parts list. But I don't see the parts list as having been posted. Perhaps you can PM the poster of that thread and he might have info which could help?
https://www.airgunnation.com/topic/benjamin-cayden-exploded-parts-view-and-numbers-list/
https://www.airgunnation.com/topic/benjamin-cayden-exploded-parts-view-and-numbers-list/
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from what you explained and the schematic it might be #0013 what ever that is, I don't think there is a removeable Transfer port in the Cayden
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