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.
Currently it's the Beeman RX-2 at 1125 FPS in a .177 pellet
I've removed the stock off of several air rifles including a few Beeman's. First I remove the two screws from the front forearm (One on either side.) Then I remove the trigger guard. The rear screw usually releases the back of the barrel assembly and it comes out. Or you could contact Beeman and ask them: See the link below
How do you remove gas cap for 2004 Lexus RX 330?
Schuyler Beeman is 6' 3".
For years Beeman was considered to be an excellent brand of air rifles. But due to economics their quality has fallen off. You will find more plastic creeping into the assembly, like triggers and trigger guards. Many users have opted to replace the trigger assembly with aftermarket units. Let me give you an example of what they have been doing. The highly prized Beeman P3 pistol sells for $220 but the exact copy Beeman P17 sells for $46. There are several other copies like the "Marksman 2004", another copy of the model P3. All of these are owned by Beeman. Beeman owns Marksman and in my opinion Marksman, once a very good air gun, is now a throwaway not made to last. I don't understand Beemans marketing strategy, Why make knockoff your own gun? So "Yes" Beeman's are Okay just not s good as they once were. My preferenc is the Gamo or Benjamin line of air guns & rifles. If you want to see a wide selection of air guns / rifles then see the link below and read the Owners reviews.
Richard Beeman was born on 1942-05-06.
Joseph H. Beeman died in 1909.
Joseph H. Beeman was born in 1833.
I located a parts list for the Beeman R1 on an English web site. Beeman is located in California. See the link below.
Greg Beeman was born in 1962, in Honolulu, Hawaii, USA.
I've taken apart several Air rifles and repaired them if you are handy with tools you can try it. If not, then contact Beeman and send it back to them to have it repaired. If you take it apart, I always photograph the dissembly so I know how it goes back together. See the link below.
How do you remove cap on armrest