Beeman two stage trigger

Send it back to Beeman for service. Funny, I answered a similar question yesterday, stored scope and same issue.

https://beeman.com/repair-requests/

Optics & Scopes ' Beeman Official Homepage

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Take a look at the trigger mechanism and the part that holds the piston back it may be a broken spring in the trigger
If not could be a mainspring coil broken stopping it cocking

Do you mean that you have never been able to cock the rifle ever

Like get the piston to lock up to the sear if so

Return to where you purchased it and get them to sort it

Try this
http://webpages.charter.net/rs_enterprises/guns/RSE%20Airguns%20-%20Beeman%20RS2%20trigger%20guide.pdf

Yes but be very careful as there is no spares available
Search beeman rs1 trigger lightening

Open up handle and check for alignment on trigger and parts. You can look at an exploded view to see all the handle and trigger parts.

My stupis Beeman RS2 dual-caliber Air rifle combo trigger broke for no reason and I cant find a replacement can someone help me?

Yes they are adjustable, both 1st and 2nd stage and also trigger weight.
The trigger group is easily disassebled and honed with fine emery paper. You really dont need a mirror surface but the factory surface is very far from smooth. There are som sharp corners on the sear and the trigger lever, DO NOT ROUND THEM.
Pay close attention to the three small springs inside, if you get them mixed up the rifle will not lock.
This work will make all the difference in your rifle.
Just work slowly and with caution not to change the angles in the trigger geometry, all you want to do is polish the surface.

Tutorial can be found here http://webpages.charter.net/guru1/documents/RSE%20Airguns%20-%20Beeman%20RS2%20trigger%20guide.pdf

The larger screw controls the pull weight, that is how many pounds weight on the trigger.

The front smaller screw controls the length of the first stage, whether you want a short first stage or a longer one.

The rear small screw controls the lenght of the second stage which can be reduced to zero.

Check the trigger guard screws. If the trigger guard has been loosened or removed, it can effect the proper position of the safety actuating lever (the lever in front of the trigger adjustment screw), preventing a full cocking stroke.