Issues with CP99 - help!

[Achitophel]

After being away for many years am starting to get back into air gunning. My preferences are plinking. Have had a Brocock TAC in the past, but was sadly decommissioned when they became restricted and I lost interest at that point.

However, have picked up the first air gun I bought, a Walther CP99. Problem is, I can't get the CO2 powerlet into the gun without the whole powelet discharging. When I slide out the CO2 magazine, I insert the powerlet and replace the magazine into the gun. I follow the manual's instructions and then turn the base of the magazine, which is presumably intended to just pierce the top seal on the powerlet. Instead, the whole power let just discharges and the gun gets quite cold quite quickly.

The embarrassing thing is, I can't remember if this was happening to the gun five years ago, or whether it's just something I'm doing wrongly now.

Any ideas gratefully received

[Phil G]

Seems like the seal at the top of the mag for the co2 has gone hard. Try some lube to soften it.

Also make sure you've tightened the brass thumb wheel enough.

Good luck, Phil

[Achitophel]

Thanks for that - on the basis I have no idea what I am doing and really don't want to knacker the seal permanently, can you suggest (keeping it clean ) what I should lube it with. I've vague memories of gun oil

[gingernut]

These are not easy to fill.
As Phil says the brass wheel needs to be really tight before you turn the base.
If you can turn the base back the capsule isnt pierced so tighten the screw again and turn the base again.
If it still leaks the seal must be faulty.

[magicniner]

Turn the base a little bit, not enough to pierce, back off & re-tighten the screw, then turn base fully & pierce,
ATB,
Nick

[gingernut]

Thats what I was trying to say .Nick

[Phil G]

Thanks for that - on the basis I have no idea what I am doing and really don't want to knacker the seal permanently, can you suggest (keeping it clean ) what I should lube it with. I've vague memories of gun oil

Pellgunoil

Check on line, it's not too expensive, well worth the cost.

Good luck, Phil

[Paul55]

Failing that, auto transmission fluid. I've heard it's the same stuff

[Achitophel]

Pellgunoil

Check on line, it's not too expensive, well worth the cost.

Good luck, Phil

Cheers for all the help everyone. Will get some of the oil, try that as well as the other stuff and post back to let you know how I got on.

[Achitophel]

Have some Pellgunoil in the post on its way to me, but also tried the magicniner & gingernut suggestions - and they worked! I did lose another two powerlets on the way, but hey, at least I finally got one loaded and was able to plink. So thanks all!

As an aside, the actual performance of it relative to my old Brocock TAC revolver was quite disappointing - the Brocock had loads more oomph from memory, with the tin can targets looking satisfyingly shattered when hit. Oh well...

[blooregard]

TACs were awesome, but CO2 has its place.

I used to love my Brocock Cobra and predator, both awesome and excellent fun

[Rayee]

I've recently discovered the healing powers of pellgunoil myself!
I won't go near my co2 guns unless I have pellgunoil in my hand!

[Achitophel]

I had exactly the same problem with an old CP88 earlier in the year and following pretty much the same advice managed to get it to work OK.

I found that dropping some Peligun oil onto the CO2 seal and leaving the gun upside down for a couple of nights really helped.

With repeated TLC of this sort it gradualy improved and became smoother. I sold it on and the last I heard it was working fine. I did wonder whether it had been left for a long time without use or lube leaving the seals to become stiff.

Hope you get it sorted.

Thanks for that - the Pellgun oil arrived yesterday, so might try to put some on once the existing powerlet is finished and leave it overnight.

I did also think that leaving the gun in the garage untouched for the last 2-3 years (including over last winter when the temps must have been very low) wouldn't have done much for the seals!

[magicniner]

Failing that, auto transmission fluid. I've heard it's the same stuff

Paul,
It isn't, it's a very posh marine engine oil with red dye in it
Regards,
Nick

[Adam77K]

Paul,
It isn't, it's a very posh marine engine oil with red dye in it
Regards,
Nick

I read that it was plain 30 weight non-detergent motor oil.
With red dye in it.