This is an interesting question. I have researched the web. But Beeman doesn't provide any drawings or breakdown of their airguns that I can find. If you look on the web at Beemans home page www.beeman.com or (See the Link below )you will find the following statement.
TRIGGER MECHANISMS in any airgun should only be serviced by an authorized service shop.
It appears that Beeman doesn't want you to dissemble the air rifle. My suggestion is find a repair shop (Look on the web) to find someone near you to make the repairs.
Unless you are extremely familiar with air guns it might be best to have a professional repair or modify your air gun.
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