In order to enable rated velocity, I wanted to adjust (reduce) the residual compression volume on my 46M.
In looking for guidance on how to take apart the piston and cocking linkage assembly
, I found instructions for how to change the piston seal.
I wanted to attach them in their original "slide show" file format, but GTA won't accept such large files; nor .exe files. So, copied, compressed and attached the images below...
I took my pistol apart and put it back together, so now feel armed to provide further advice on the topic
Do yourself a favor; take the front sight off. Leaving it in place forces contortions of the piston to get it in and out. I was not prepared to risk any damage to the seal, so I took the front sight off. Not that the end of the compression cylinder is sharp, but as a matter of general principle; why make something difficult when it does not have to be.
At first, I could not get the left hinge support guide, shown in "photo 8" to come out of the compression cylinder. I was not going to brute force it. Then it occurred to me that the "barrel band" had slightly collapsed the compression cylinder, such that the hinge support guide was being trapped (due to the fact that the cylinder has a groove cut at the front). Removing the barrel band freed up the "stuck" part. However, I would advise against completely removing
the barrel band, unless you have no other choice:
The most difficult aspect in taking apart and reassembly of this pistol was reinstalling the barrel band. I battled to get the screw to start in its nut. Later figured out the nut was canting over in its recess. Thus, my suggestion to not completely unscrew the barrel band retaining screw; if you can help it. I believe that just taking the load off the compression cylinder by breaking the tension on the barrel band screw should be enough...
To remove the valve actuating plate on top of the barrel, cock the valve by flipping up the TP lever by hand; without charging the pistol with air
. The rear of the piston needs to be forward of the the little window in the top of the cylinder that the valve cocking plate hooks into. The rest of this action is explained in the attachment, and it is as simple as it looks.
Once you have the pistol stripped this far, it becomes apparent that it really is beautifully simple in design and construction; and quite easy to work on.
Had to attach individual images due to single file size limitations. Continued below...