FX FX Impact M4 700mm sniper - slow leak

[Camsleadslinger]

Hi All,
I have a brand new M4 that has about 150 shots through it. I have developed a slow leak already. It’s around 1-5 bar per day. I have followed the Airbuks video on YouTube for the M3 and have been over the rifle with leak detection spray and can’t see any sign of bubbles.

Things to note

- when I first received the rifle I had a few times where I double loaded pellets/ shot them out because the trigger was not setting properly and I was cocking twice when I should have been removing the magazine and re-cocking (lesson learnt!) That issue is sorted.

- Another issue is when I was first starting to tune for larger pellets in inadvertently adjusted the macro wheel while the gun was cocked. I dialed it down from 16 to 8 before I realised. Yes I know this is a no-no but thought I should mention it in case this could cause an issue.

I’m completely new to airguns and learning as best I can but need some helpful advice.
Thanks in advance!!

 

[Trucker3573]

I am by no means positive but it doesn’t seem like moving the wheel while cocked would cause a leak. Possibly damage that mechanism. Does that seem to work fine ?? How many days have you let it sit without being fired in order to determine it leaking? If it is leaking I would probably wait on only 1-5 bar a day. That is so slow it shouldn’t effect performance and it will eventually get worse and be much easier to find.

 

[ImpactX]

Turning the power wheel when it's cock will not make it leak but it will damage the power wheel if you keep doing it. Double loading will not make a leak, but can jam or clip the moderator when it exit. The impact have like over 30 o-rings, so it's hard for us to tell you where it is leaking from. If you are new to pcp, the impact shouldn't be your first gun. You need to know how pcp works, how to take it apart, what each part does, how to reassemble it back together. I would recommend go buy a leak detector that doesn't cause rust/corrosion and start spray everywhere on the gun till you see bubbles coming out. Then it's as simple as changing an o-ring.

 

[Firewalker]

A common place for a slow leak to happen is the valve, just a microscopic bit of lint will do the trick.

Put a balloon over the barrel, make sure the bolt is in battery and see if the balloon goes from limp to round in a day or two.

 

[Aesalon]

My FX Panthera 700 came with a leak on the regulator valve from factory. I know that it is a different gun, but this is a common place where leaks can occur in these guns in general. Just try to adjust the regulators a tiny bit (e.g. 1/8 of a turn left or right). I did this then the leak stopped. After that I have continued to tune and adjust the regulator and the leak didn't come back (knock on wood!)