Canadian Airgun Forum

I put an Altaros Regulator into my AA S400F, trying to increase shot to shot consistency and hopefully shot count as well.
I noticed that if I filled the gun to 200 bar the night before, next morning the regulated air pressure would be close to the air tube pressure, even if the regulator setting is 105-110 bar.
Upon contacting Altaros, they suggested that the air leakage most likely is not internal but through the outer o-ring on the regulator body. Either it was damaged during installation or the air tube is not smooth internally.
I removed the regulator and inspected the new o-ring that I installed. It was fine. However, sticking my finger inside the air tube I found the internal threads are extremely sharp, also I could feel some minor roughness on the air tube's internal surface.
I went to Canadian Tire and purchased a brake honing tool. Using some motor oil as lubricant. I honed the air tube's internal surface as far as I could reach with the honing tool from both ends of the air tube. After that, I cleaned the tube with brake cleaner spray then re-lubed with silicon grease/spray and reassembled the gun.
Last night before going to bed, I filled the air tube to 200 bar. The regulated air pressure was at 105-110 bar. This morning, The regulated air pressure is still at the same 105-110 bar.
I think the issue is resolved.

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AirArms TX200HC
AirArms S400F
Diana Outlaw
Feinwerkbau 300S
FX Dreamline Classic
Weihrauch HW100KT FSB
Weihrauch HW97KT
Weihrauch HW50S
Artemis M16
Artemis PP700
Weihrauch HW40
Beeman P17
Stoeger XP4

Excellent! I also have an Altaros regulator but in a Hatsan AT44 air tube. The problem I had was leakage between the outer O-ring and the tube which I solved with honing the air tube as well. I think a set of brake hones, or ball hones in my case, are a very useful addition to the maintenance kit. I bought a litre of honing oil when I got my ball hones and most of it is still there. BTW, I first got the hones to take care of my break barrels compression chambers, deburred, and x-hatched. But I have used them on many other tubes since then.

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Iacio, ergo sum

Hi Duke,

Great idea for using it on piston guns. I may just try that next.

Your hands-on ability for sure is better than mine. Never took machine shop in high school, I am still learning to work on my guns with simple tools.

Thanks,

Tom

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AirArms TX200HC
AirArms S400F
Diana Outlaw
Feinwerkbau 300S
FX Dreamline Classic
Weihrauch HW100KT FSB
Weihrauch HW97KT
Weihrauch HW50S
Artemis M16
Artemis PP700
Weihrauch HW40
Beeman P17
Stoeger XP4

The Altaros reg leakage returned. This time I followed Altaros video to replace a small o-ring on the plastic adjustment nut. After much fiddling, the pressure was set at 100-105 bar. It stayed there for two days so far.
While the gun was apart, I cut the factory hammer spring by 1/2 coil then heated, reshaped, ground the coil ends. Also, adjusted the valve return spring tighter.
The result is a steady 12 fpe output for 80+ shots from 200 bar to 100 bar. Spread is around 20 fps.
I think the gun will be a great WFTF class FT shooter. Maybe I will keep it!

我從使用 Tapatalk 的 TAS-AL00 發送

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AirArms TX200HC
AirArms S400F
Diana Outlaw
Feinwerkbau 300S
FX Dreamline Classic
Weihrauch HW100KT FSB
Weihrauch HW97KT
Weihrauch HW50S
Artemis M16
Artemis PP700
Weihrauch HW40
Beeman P17
Stoeger XP4