I should perish the thought, I know. But I keep wondering what the tricky part is. Is a special jig required to get the pistons properly offset?
I'm just curious.
Thanks,
--
Dan (in NY)

as I recall.it took a couple tries to get it right...from memory,the timing gears,under the covers on the side,go in last as you move the working piston slightly with the barrel.It has been near 20 years,so detail is a bit foggy...

Just send it to Randy Bimrose.
barrelbender@earthlink.net
They are a pain to work on!

I ahve one i just took apart. Quite easy to take apart. Seems like if you screw the endcap on, they should line up correctly.

Mine needs repairs too...

how much is that guy charging,

I just need parts, as i can do it myself.

No disrespect but anyone can pull an airgun apart.It's getting it back together that is the problem.
I must reiterate that these are a job for an airgunsmith very familiar with them.THere are tolerances to deal with as well,as other little tricks that only experience will resolve.
A common result of unqualified work is both pistons with missing and broken teeth.Not good and certainly not cheap.
You have been warned!

Care to share any of these little tips?
I dont want to spend more then i did on the pistol for a rebuild. I've seen rebuilds going around 100 dollars.

No.
I'm in Australia and am not sure of your charges but I do know that Randy Bimrose will do a superb job at a very reasonable price.

Just to amplify Lewis's comments, if you should happen to break a part while working on the gun (knocking a tooth off the little controller cogs is quite easy to do for instance), these parts are extremely expensive to replace. You could end up out the cost of a rebuild, AND pricey replacement bits.

Not knocking your abilities, and obviously the things are not impossible to fix, but it does take a certain amount of specific experience. Randy B has done a couple Giss guns for me and his work is SUPERB, and very reasonably priced considering all he does.

Mike is always right!
I am sick of getting airguns in that some baboon has butchered.THe Giss guns are far beyond most peoples' abilities but that does not stop "gunsmiths","engineers" and "Fitters and turners by trade",having a bash!
Typical damage that puts them in the scrap bin or prohibitively expensive to repair, usually include
1.Chipped and broken teeth on both front and rear pistons.
2.Stripped threads in the receiver where the cam gear covers screw in.
Of course,missing parts help the bill along too.
The Giss guns are not easy or pleasant to work on and must be worked on in a sequence,especially the Model 75.Pay whatever Randy wants and enjoy it!

i paid 100 dollars for the pistol. I dont want to spend another 100+ just to have some guy who has some experience to put it togeather.
I know i'm being unreasonable, but i simply dont have the money to spend.

Thanks for the advice, and i'll see if i can't ask randy for some tips.