Noob air seal question

[Sjkendall]

I am currently trying to track down an air seal  issue, So before I open up the gearbox to further investigate I was wondering if the below video is normal, 

the metal circular seal doesn’t fit in permanently or click in place etc. is it normal for this piece to be freely sliding up the barrel ?. 
 

thanks 


IMG_9226.mov

 

[Enid_Puceflange]

Apply a bit of pressure , it should slip in between the front of the hop unit and barrel, helps to keep the barrel tight to the hop unit

 

[The_Lord_Poncho]

Yes, some tighter than others. I've had both extremes - a very tight fit (eased with a bit of silicone oil), and very loose fit (rectified with a few wraps of PTFE tape). If you are needing force to seat yours in this case, after you have finished wrestling with it take care that the barrel hasn't got twisted within the hop (and therefore that the nub remains directly seated above the bucking patch).

 

[Shamal]

It's not a seal in any sense bud it just helps to take up any slack between the barrell and hop.

 

[Sjkendall]

Thanks for the help guys. 

 

another noob questions… 

when I cover all holes ( bb receiver + end of the barrel) and I blow through the other end there is a slight ( very slight ) leak of air going somewhere. Is this normal ?? 
 

thanks 

It's not a seal in any sense bud it just helps to take up any slack between the barrell and hop.

Thanks

 

[Colin Allen]

when I cover all holes ( bb receiver + end of the barrel) and I blow through the other end there is a slight ( very slight ) leak of air going somewhere. Is this normal ?? 

If there is a very slight leak, that is probably normal as the sealing of the ends may not be perfect.

With the gun assembled and the nozzle fully forward, shine a light up the BB feed tube and look down the barrel; if you can see a ring of light, the nozzle is not sealing in the hop lips.

 

[ak2m4]

Give us some fps stats, also have you changed anything (I can see a spring in the video), is it all stock etc etc etc. 

 

[Sjkendall]

Give us some fps stats, also have you changed anything (I can see a spring in the video), is it all stock etc etc etc. 

With an m120 spring it’s 310fps 1.01 joules. So way under the performance of that spring, everything is stock other than the spring , the stock spring was a m100 and was only getting 240 fps 

0.25 BBs

If there is a very slight leak, that is probably normal as the sealing of the ends may not be perfect.

With the gun assembled and the nozzle fully forward, shine a light up the BB feed tube and look down the barrel; if you can see a ring of light, the nozzle is not sealing in the hop lips.

Will try thanks

 

[Colin Allen]

With an m120 spring it’s 310fps 1.01 joules. So way under the performance of that spring, everything is stock other than the spring , the stock spring was a m100 and was only getting 240 fps 

That is very poor; what is the length of the inner barrel?  Do you have a photo of the cylinder showing the window?

 

[Sjkendall]

That is very poor; what is the length of the inner barrel?  Do you have a photo of the cylinder showing the window?

380mm the inner barrel, its a vfc avalon rapier the barrel is quite big. , a photo of what mate? sorry im a noob. 

i did what you suggested about shining a light, i do see the light through the barrel constantly. when i look up the bb feeding tube, the nozzle from the lower receiver only covers the hole when i fire the RIF. (the nozzle cannot be seen through the feeding tube unless i fire for a split second ) 

 

[Lozart]

If any of the multitude of VFC teching videos are anything to go by, the piston probably fits like a dick in a shirt sleeve.

How up for ripping it apart and tinkering are you?

 

[Sjkendall]

If any of the multitude of VFC teching videos are anything to go by, the piston probably fits like a dick in a shirt sleeve.

How up for ripping it apart and tinkering are you?

im totally up for taking it apart, just all new to me so dont know terminology, part names etc etc. 

so the piston is known to not fit very well in its surround ?

 

[Sjkendall]

Is this normal operation for the tip?. I’ve seen on other videos it retracts first then pushes forward with the air ?



IMG_9229.mov

 

[Shamal]

Is this normal operation for the tip?. I’ve seen on other videos it retracts first then pushes forward with the air ?

IMG_9229.mov

Not 100% sure but is the gun working?

 

[Sjkendall]

Not 100% sure but is the gun working?

Yeah all works and feeds fine. Just a loss of pressure somewhere  

 

[Shamal]

Yeah all works and feeds fine. Just a loss of pressure somewhere  

Ok so it works pretty good that's a start. How about that air nozzle. It looks like an old plastic one and some of the plastic air nozzles didn't have an o ring. Could be loosing some pressure there.

I'm guessing you have checked the hop up bucking for holes?

 

[Sjkendall]

Ok so it works pretty good that's a start. How about that air nozzle. It looks like an old plastic one and some of the plastic air nozzles didn't have an o ring. Could be loosing some pressure there.

I'm guessing you have checked the hop up bucking for holes?

yeah hop up and bucking are intact , the air nozzle is plastic i cant tell if there is an o ring or not in place, it is a vfc avalon v2 gearbox. think its time to bite the bullet and open the gear box 

 

[Shamal]

yeah hop up and bucking are intact , the air nozzle is plastic i cant tell if there is an o ring or not in place, it is a vfc avalon v2 gearbox. think its time to bite the bullet and open the gear box 

Yeah I think it would be good to check if that nozzle has an o ring. Plus you can check the rest of the compression side of things. V2 boxes aren't that scary.?

 

[Colin Allen]

Yeah I think it would be good to check if that nozzle has an o ring. Plus you can check the rest of the compression side of things. V2 boxes aren't that scary.?

The compression on VFCs out of the box is usually awful, which could be a major part of the problem.

 

[Sjkendall]

The compression on VFCs out of the box is usually awful, which could be a major part of the problem.

Aye the compression on the piston is pretty naff. Would you suggest a new piston from a different brand ?

Yeah I think it would be good to check if that nozzle has an o ring. Plus you can check the rest of the compression side of things. V2 boxes aren't that scary.?

Thanks mate. Yeah there is no o ring on the nozzle however I cannot see anywhere where on may go. 
 

checked the inside of the gearbox and the compression isn’t the best