is it the seals

Just cut out an insert from milk bottle that stops the movement of the piston head so will get thin sheet metal for that tomorrow. The gas tube is thinner, but has that grove around it which would be ideal for a grommet so that's a good idea. Cheers. Aaah a lathe if only, milling machine for stock be handy too. sigh. Solid Bush mechanics for me.

I've just epoxyed the plastic from milk bottle to the piston ram head as it's such a good fit and doesn't move as it's always hard against the piston. The gap between the gas chamber and the piston is rediculous. Is about 3mm all the way round. I'm going to expoxy a shim on the gas chamber, piston arm end, to keep the piston level enough to go over the oring/grommet I'll put on, without it just chewing it up. It's Friggin crazy there's no way that gamo makes guns so far out of spec.Something is not right in my opinion.

Edited by kruzaroad - 16 Aug 2022 at 6:54pm

gun is stored horizontal,usually vertical when closing the barrel,I think the bit of lead was from the mag when it was on, it damaged the pellets and didn't push them in very far. The scraping on the gas chamber was at the bottom the piston damage top (except bit of lead). That piston pic is after the brake clean and wiping it! Gun City who sold it know nothing , they recommended young's when asked if they could get seal in. Hunting and fishing tried to order seal but couldn't get one as gun City is sole supplier of that model. I voided the warrenty taking the mag Off.
I'm dealing with vaughans now who are the gamo importer (have been since mag issue, which I decided to not take free replacement) . They sujested might be easier to get whole trigger/gas housing instead of back rubber, and got a quick rundown on what I have to do with it to get it running and I don't need the expense.So they know about it. Their OK he's looking to see if he has it tomorrow.
But saving grace is I have tx, which has been a pleasure. Everything with that process was smooth from enquire to delivery to shooting. When I asked about a tuning kit he recommend not to put one in as they are constantly removing them and turning back to stock.
Live and learn. If I had the machinary to make the parts I'd be in heaven and loving all the faults. For now number 8 wire.

May have a found a big part of the issue going thru the schematic . Part number 16080 is totally missing.
It's a spacer that stops the cocking arm from moving up when breaking the barrel.(checked out motion on gun this morning)

I'm now of the opinion that the end of cocking arm has been lifting into the gas cylinder body and sliding along it, pushing it up, causing the ram to lift the piston. This has corrected itself when barrel closed but caused undue pressure on piston seal,
metal on metal rubbing inside of reciever

and probly uneven seating of the piston when cocked. Which would explain some of the peaks and drops in chrono readings as the tolerances would allow it to tilt.
Wether it's broken or worn thru and fallen out, just dropped off as its a clip,out or was never there I have no idea but I've never seen it, or noticed it on my work bench.
Emailed Vaughans for one this morning for new one.

we will see. just in town now looking for 3000 grit sand paper. Can't find jb non embeding barrel cleaner anywhere. Of to repco see what valve grinding pastes they have.
it's all fun. if it don't shoot well I'll turf the bloody thing.