KSC G19 Blowback problem

[Nick_273]

This is a fairly new ksc g19 and has had about 1500 shots throught it. When it fires, it offers a very weak and unconvincing blowback. Some shots have harder kick back then others but in general they are all much weaker than before. Before I took it apart, oiled the internals, and the rubber gas nozzle, the gas just spewed out of the gun. Now at least it fires, but as said above, the kickback in horrible. This has happened only recently and before it was firing extremely well, with awsome blowback and cycling.

Thank you. Any help is appreciated.

[ILLusion]

Check the floating valve. See if the cap is still attached to the stem.

[Nick_273]

I havent checked that yet. This is my first airsoft gun and i havent taken my gun completely apart yet. I took off the slide, outer/inner barrell, and thats pretty much as far as i get. I would need some instruction if i go deeper because i dont want to f anything up.

[WhatTheWho]

http://www.skirmish.at/scans/manuals...g19_manual.jpg

To access your blowback chamber, unscrew part#18 from the rear of the blowback chamber. Doing so allows the entire blowback assembly to come out; though, you'll need some firm banging against your hand as the chamber is held in the slide by friction at this point.

Once the entire chamber block is out, you can slide off the blowback chamber, part#22. Be aware of parts#23 as they can freely slide out.

After slideing the chamber out, examine the inside, as this is where the floating valve is seated, part#24. Check to see if it's not broken or misaligned, or anything that may seem unual. You could also check part#27, as this is the piston which creates the seal for blowback.

[Nick_273]

I now have part 22 seperated from part 88. I still dont, however, have the floating valve (part 24) seperated from 22. Is the floating valve infront of, or behind the spring inside part 22?

[WhatTheWho]

Behind the spring inside part#22. It's actually seated partially inside the spring.

Removing part#26 will allow you to take out the flow valve.

Or, since you have part#22 out, the blowback chamber, you can just stare down the nozzle or up through the gas entry point of the chamber and see if the flow valve is not broken or not seated properly.

[Nick_273]

i cant see very well if i just look throught the gas entry. how do i remove part 26? i dont want to break anything, so do i just press on it hard with a thin object or what?

[WhatTheWho]

Yes, it comes out by using a thin nail or such to push it out.

However, it should only easily come out in one direction, as one end is toothed to create a friction fit with the blowback chamber. Push it out from the side opposite of these teeth. The toothed side should be noticeably larger in diameter.

[Nick_273]

Great... thanks. Ill post my results tomorrow.

[Nick_273]

Alright, here are my results:

After much pushing and prodding, i finally removed the pin which holds in part 24. I took it out, and all that remained of the floating valve, what its head. the stem was completely brocken off and nowhere to be found (obviously broke off during use of gun). I will obviously need to buy a new floating valve... Here are some questions to which I need answers:

1) After trying to get the pin (part 26) back in, it wouldnt go in as far as it was before i took it out. I tried pushing quite hard but i dont want to bang it too hard since the chamber (part 22) is made out of plastic. Is this normal?

2) After getting the pin (part 26) back into the slots, what possition should the spring (part 25) be?

3) From where and what kind of a floating valve should I replace the brocken one with?

[mirage13]

Be patient try reseating the whole assembly (ie remove and replace) and try inserting the pin again.

it only goes in one way and it shouldnt take more pressure than one finger, i remeber mine slid right in nicely on the third try.

and don't anyone think about quoting that last sentence!!

[Nick_273]

Thanks.

Any answers to the other questions?

[WhatTheWho]

Originally Posted by Nick_273

1) After trying to get the pin (part 26) back in, it wouldnt go in as far as it was before i took it out. I tried pushing quite hard but i dont want to bang it too hard since the chamber (part 22) is made out of plastic. Is this normal?

It should easily be reinserted back into the holes of the blowback chamber. As mirage13 pointed out, part#26 only does easily fit back into the chamber one way.

Originally Posted by Nick_273

2) After getting the pin (part 26) back into the slots, what possition should the spring (part 25) be?

If you where putting everything back into the blowback chamber from scratch, the order of assembly should be:
1. Spring (part#26) which should fit inside the nozzle of the blowback chamber.
2. Floating valve(part#24) in which the head (the three-part section) sits inside the spring.
3. The pin part#26, which goes in last. You will have to press down on the floating valve to compress the spring so you are able to insert the pin. The floating valve must sit in front of the pin I.E. between the nozzle and the pin. Once in, the floating valve should be held in place inside the chamber by this pin.

Originally Posted by Nick_273

3) From where and what kind of a floating valve should I replace the brocken one with?

I would advise getting a Firefly rocket valve instead of purchasing a stock replacment.

I believe Illusion might have 1 left for sale; otherwise, you should be able to order this part from most any offshore retailer, or a few parts group orders here on ASC's parts/accessories for sale section.