Here is a tutorial on which orings to replace on an Autococker ram. I cover the disassembly, oring replacement and reassembly on both a Brass WGP Autococker ram and a later aluminum model.
To disassemble your WGP Autococker ram please view this video first:
After breaking the loctite on the ends of the ram you can disassemble and replace the oring.
These orings work on a classic brass ram and may work on a new style WGP ram as well.
Find bumpers here:
And more Rams and parts here:
Find more classic paintball technical and product videos view this playlist: