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Some of the early 35's suffered from poor brazing (cylinder plug to main tube) here..... .....which creates a huge amount of lost volume, or in other words horribly low compression ratio (on a rifle that already has a very low comp ratio). Im not saying this IS causing your results, but if...

Here is how it looks out of the pistol fella- You won't have the delrin washer/ oring (I swapped out the leaking u cup seal). To remove the valve you need to remove the pump/ valve from the chassis and knock through the pins that hold the hammer to the valve body. You can then just unscrew...

Thank you kayaker, that's a very big compliment indeed 👍 Still intend to powder coat all the parts one day (I have a little tribostatic set up at home) but I'm a sucker for a new project so rarely complete anything 😁 🤦‍♂️ Quite alot of work went into the baffles of the moderator (my lathe and...

It looks to me like it's available in the Umarex Notos though.....alot of similarities!

It's all homemade kayaker....

Agreed, great little pistols. Carbined mine about 3 or 4 years back..... Doesn't see much action (prefer springers) but nice to have in the armoury.

The light and ultra both have the pressure relief valve. You should be able to hear the PRV if it's the cause Rayan (holding the pistol to your ear) as it doesn't dump, but rather allows the air to bleed, reasonably slowly, as it re seats/ seals again.

That makes more sense 😁 Best to try oiling it as per manufactures recommendations before making any further changes fella (let us know your results afterwards) 👍

Hi there Rayan51, Please don't take this the wrong way, but are you sure the readings you are stating are fps and not mps? We're you shooting the pistol prior to testing over the chrony? Is it VERY easy to pump? At 85fps you're looking at around 0.2fpe, and 120fps 0.3fpe.....barely enough for...

Would have to be my Diana 48/52 bullpup-

Happy days, glad you got it sorted fella 👍

That's a result borne2fly, happy days 😀 Here is a pic of the valve assembly (yours won't have the delrin washer/ oring, as above I swapped out the original valve stem seal on mine). The valve return spring is pretty mighty, but oiling the system doesn't always reach the valve stem seal as...

But don't hold me to that 😂

At a guess......I'd have to go with either the 2nd stage pump cup having hardened, or the oring that sits under that piston nose. The first stage pushes the atmospheric air in front of that seal, so if either have hardened the air will just return back in to the 1st chamber. If the first 2 pumps...

The oring kits are available, but unfortunately I could only find two sources for the U cup seals.....a company in France and the other a polish seller on ebay, but from both it was looking close to £100 plus posted to the UK 😬 I opted to swap out all of the U cup seals (apart from the...

Unfortunately it could be a number of seals borne2fly. There are 2 seals on the first stage pump head (inner and outer), and another 2 at either end of the first stage cylinder- You then have the second stage pump u cup, with an oring under the head which acts as a check valve (allowing the...

For the record, atak arms/ Zoraki list their pistols as the light and ultra-

Yes, I understand increasing barrel length will increase fps Mike (providing any give action is producing enough energy, which is generally a given with total loss valves) that's why I turned up the longer barrel for mine....so I could make the UK limit on 2 pumps instead of 3. As it happens I...

I believe there must be some difference in volume between the standard and ultra Mike, based on the data below posted by a fella on the GTA detailing the output differences going to a 14.5" LW barrel- His max outut results mirror mine after I turned up a longer barrel, except for the fact his...

Have to agree with you Mkevv, with It's plastic construction and bulk, it does feel a bit toy like, but the design is really quite clever. The step down to 10mm on the second stage pump has a big impact on reducing pumping effort, and the direct to bore valve makes it a very efficient pistol to...