I would contact Walther directly and ask for a parts drawing.
See the link below
On the bottom of the rifle in front of the trigger assembly
Videos of how to assemble an M4 Airsoft rifle can be found at YouTube, as it is always easier to see how to do such an assembly than to read it. Rifles should always be kept away from children.
Walther
The trigger is held by 2 screws and one pin that needs to be pressed out. See the link at the bottom of this page.
Remove trigger pin with action un-cocked . http://www.histandard.info/manuals/sears/rfrifles/index.html
There were a few that do not have a standard trigger, but use a THUMB trigger. Do a web IMAGE search for Winchester thumb trigger rifle, and you will find it.
Very good
If you are referring to a "SET Trigger" on a rifle. The Set Trigger releases all the normal mechanisms in the action but does not release the hammer on the rifle, but it sets up the firing trigger to act like a "Hair Trigger" just barley touch the firing trigger and the rifle goes off. It's used in hunting. It is common on black powder "Hawkins Rifles."
Depends on exactly what the rifle is, and how far it's disassembled.
How do you assemble a jc higgins 103.229 22 rifle
rifle basix makes the trigger of your dreams..
Ask a gunsmith for help.