R7 problem.

[Bellycrawler]

Recently my R7 .22 started playing up. No problems then first of 3 was low shot count. Run low on its 3rd mag (fac with small buddy bottle) where normaly its OK & get possibly 4 mags worth of air. I fill to 190 simply to fill all my rifles the same rather than keep tabs on individual rifle pressures. 2nd of 3 the 1st mag was OK then lost air due to the buddy bottle come loose. 3rd of 3 1st mag OK, each single shot I nipped the buddy bottle up, verry little movement but it was there. 2nd mag first shot was OK but air dropped after the first shot more like plummeted. I first suspected the buddy bottle valve & will check it later. Is there anything else it could be ? It appears to hold air when not in use. Allthough it's fac, fast flow valve, it's the same as a legal limit fault. Any ideas ? I don't know / understand the workings of a pcp, just slowly learning.

[angrybear]

If the bottle is coming loose, that's your problem because it shouldn't
I have to clamp the stock between my knees & use both hands to initially twist the bottle when it's sealed & pressurised.

Either you aren't tightening it up fully to start with, or the threads are shagged.

[Shed tuner]

Either you aren't tightening it up fully to start with, or the threads are shagged.

..or the o-ring on the bottle is so worn it's not gripping / sealing / working at all...

[angrybear]

..or the o-ring on the bottle is so worn it's not gripping / sealing / working at all...

In which case surely you'd hear the hiss of escaping air
but I'd still expect the pressure to hold the bottle quite firmly.

[Shed tuner]

In which case surely you'd hear the hiss of escaping air
but I'd still expect the pressure to hold the bottle quite firmly.

I agree, but as this is a pretty weird scenario, I'm fine with suggesting it's worth checking....

[Anothermiss]

Bottle energising too early?

[JLB]

Bottle energising too early?

This. The early bottle adaptors have an adjustable pin that pushes on the bottle valve, these can come loose overtime and need readjusting. A bit of loctite will ensure it doesn't move again.

John.

[Bellycrawler]

It's a Mk1 so early valves. I've checked the buddy bottle valve, no leak, the o ring looks OK but I will replace soon. I assumed some internal fault as it was a sudden increased air use / loss. I'm haveing another try to.orrow & make sure the bottle is screwed down tight. Maybe my brain went auto pilot don't over tighten mode a simple schoolboy error ?? Tommorrows update will be a red faced oop's moment admission or questions all about energising the valve workings.

[Bellycrawler]

Nearly an ooop's schoolboy error.tightened the buddy bottle as needed. Checked everysot 1st mag, no movement. No drop with 4 mags but sounding a bit limp on the last few shots. Even though I was holding the buddy bottle I found it was loose at the end of the session. I started to unscrew it & the air released after a few twists. My fault entirely but it still come loose. Putting a new o ring on before trying again. I blame useing tube pcp's recently & simply forgot the needed method for it to be a problem as per my original question.