downgraded issue

johnnytiitlips

a friend of mine just received a cyma ak47 and a jg g36 from gunner airsoft.these aeg's reach ~ 450 and 380fps respectively.gunner kindly
downgraded these to just below a joule.well,kind of.
we put a few 100 rounds through them each,oiled and cleaned them
both.we then went on to chrono them both,expecting them to be fairly
close to a joule.
ak was first up,and from the start there was an issue.bb's kept falling out
the front of the barrell.then we chronod it 4-5 times.149fps was the average.checked a few pistols and aeg's to make sure it wasnt the chrono,but it wasnt at fault.
then tried the g36.190fps.messing with the hopup raised it 10-20fps.
what would youre thoughts be?
returning them wouldnt be feasible,as the shipping costs would far exceed
the cost of a couple of hours work from someone suitably skilled here.

Puding

know gunner it is going to be a poorly drilled nozzle or cylinder im afraid, you will need to replace nozzle/cylinder and change the spring to down grade them correctly

johnnytiitlips

was thinking they might have cut the springs instead of putting in a new one,
and cut them too short.waiting on a reply from them at the moment,but not
holding my breath.will end up probably giving them to yourself in the not too distant future.

Puding

normally they just stick a drill bit up into the mag well im afraid, the easiest way to check is to have a look at the g36, you can take out the pins on the magwell and at the back of the receiver, take off the magwell section and also unscrew the bolt at the back of the receiver , you will then be able push the hop up unit forward and pull out the gearbox/lower receiver, you can then inspect the cylinder and nozzle, will try and find a link to a guide for you

also you should be able to remove the block holding the hop up on the ak in place and push it forward exposing the nozzle, you can inspect this as well

Puding

take down guide
http://www.airsoftforum.com/board/G36-Takedown-Guide-massi-t43274.html

you just need to do the first few steps untill the gearbox is out and you can have a look at it

Masada

Does it sound weak or odd when you fire it? if its been drilled then its likely it'll sound fine, just be low powered. if theres any kinda odd noises of dull thud as it returns then its more likely a problem internally, a number of things can cause it.

johnnytiitlips

Puding wrote: »

take down guide
http://www.airsoftforum.com/board/G36-Takedown-Guide-massi-t43274.html

you just need to do the first few steps untill the gearbox is out and you can have a look at it

excellent,thanks

johnnytiitlips

Puding wrote: »

take down guide
http://www.airsoftforum.com/board/G36-Takedown-Guide-massi-t43274.html

you just need to do the first few steps untill the gearbox is out and you can have a look at it

they both sound perfect

it'll be the last aeg that he'll buy off them

Firekitten

johnnytiitlips wrote: »

a friend of mine just received a cyma ak47 and a jg g36 from gunner airsoft.these aeg's reach ~ 450 and 380fps respectively.gunner kindly
downgraded these to just below a joule.well,kind of.
we put a few 100 rounds through them each,oiled and cleaned them
both.we then went on to chrono them both,expecting them to be fairly
close to a joule.
ak was first up,and from the start there was an issue.bb's kept falling out
the front of the barrell.then we chronod it 4-5 times.149fps was the average.checked a few pistols and aeg's to make sure it wasnt the chrono,but it wasnt at fault.
then tried the g36.190fps.messing with the hopup raised it 10-20fps.
what would youre thoughts be?
returning them wouldnt be feasible,as the shipping costs would far exceed
the cost of a couple of hours work from someone suitably skilled here.

If they drilled the nozzles, check the hop units have been seated back correctly... In g36s it can catch forward a bit and drop that much... i had that once.. baffled me till i worked it out lol. Same with the AK, they can slide forwards if not secured back enough after modding. OR it could be TOO drilled. either or.

Gatling

sounds exactly like my 416 from gunner sub 100fps on the chrono turned out who ever decided to drill the airnozzle decided to keep going through the piston head psiton and partly out through the mech box ,
ended up scrapping the mech box for a mauri v2

Masada

By going through the nozzle? Surely you mean the cylinder? or else you had the yorkshire ripper doin the downgrade., lol

Gatling

Masada wrote: »

By going through the nozzle? Surely you mean the cylinder? or else you had the yorkshire ripper doin the downgrade., lol

downgrade it was rapeage ,never seen anything like it .have to find my old phone with the pics

you would have taken one look at it and laughed

Buckmark

Same thing happened me with Gunner Airsoft, have'nt stripped the Cyma 048s yet, its about 150 fps, I finally got them to answer my emails and they said they cut the hop up rubber, we'll see, I'm opening it this week.

Firekitten

Masada wrote: »

By going through the nozzle? Surely you mean the cylinder? or else you had the yorkshire ripper doin the downgrade., lol

Hey now... I might be at university in yorkshire but I'm not that bad on downgrades

I'm a new spring sorta gal... Only way really. Drilling anything ruins air seal and causes turbulance... oh god, im sounding like Phra.... *shuts up*

Buckmark: Cut the hop rubber? purposefully? Erm... I'm a little confused on that one... why? Puding... Masada, this cant be me missing the point of this one is it?

Beez

Is drilling a common way of downgrading or is changing the spring??

Inari

Both are common, but drilling is faster easier and cheaper, so overseas retailers do this to allow it to pass through customs. Here, however, the majority of retaileres downgrade with spring.

Beez

Spring is obviously preferable then?

Firekitten

Spring swap maintains peformance of the gun, and eases stress in the gearbox.

Drilling essentially makes the gun less efficient, and makes up for that by having a bigger spring. Its... just bad. There is never a good side to it imo.

Beez

I see, thanks.

Frank the Manc

Firekitten wrote: »

Spring swap maintains peformance of the gun, and eases stress in the gearbox.

Drilling essentially makes the gun less efficient, and makes up for that by having a bigger spring. Its... just bad. There is never a good side to it imo.

Youve changed your tune anyways...:rolleyes:

Firekitten

No I havent :P

Ive said how it can be done, I have never said I aprove of the method, or have used it.

I havent ever used it, or wish to. I always downgrade by springswap, always have.

But then if you read you'd know that.

Beez

Does anyone know how Co2 Gas pistols are downgraded since they have no sping?

Masada

Depends on the system but its often a case of changing the valve.,

Buckmark

Buckmark: Cut the hop rubber? purposefully? Erm... I'm a little confused on that one... why? Puding... Masada, this cant be me missing the point of this one is it?[/QUOTE]

Leftyflip

The hop up rubber is what contains the air pressure in the barrel, without that you'll get no fps and bb's will spill out. When the rubber gets worn and torn you start to lose fps, with a hole in it like that, you'll get very little.

Buckmark

This is the Gunner Jing Gong G36, just opened it, large section cut out of hop up rubber ( bucking ) chrono reading 210fps to 240fps, swapped it for the hop up rubber out of a Uncompany Jing Gong G36 ( uncut ) and its now reading from 360 fps to 380 fps. Nearly half the top O-ring is missing, from the cut section.

Masada

Holy jaysus., Ive seen some bad ones, but thats a bleedin joke.,

Good news is, its only a cheap part that doesnt take too much dismantling.,