kwa usp gas problem

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JCL
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kwa usp gas problem

Post by JCL » Tue Sep 09, 2014 4:04 pm

I'm new to the whole gbb thing so I have no idea what the issue is. I put a full mag in the gun and when I go to fire and it releases all of the gas. One mag will allow one shot with a bb and one to 2 more without a bb and then it releases all of the gas. The other mag releases it all on the first shot. I'm wondering if it's the gun, magazines, or both and if and how I can fix it. I have a video if that will help.

Edit: I should also mention that this gun is brand new. I got it yesterday.

Edit 2: if I only put one bb in the mag, the slide does not lock back
JG 614 Full stock
S&T TAR 21 metal gearbox
VFC UMP GBB

KWA USP
WE 1911

My youtube channel is ArbiterAirsoft

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Guges Mk3
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Re: kwa usp gas problem

Post by Guges Mk3 » Wed Sep 10, 2014 11:34 am

How are you filling it and what is your gas source?
I rather use a "nightmare" that shoots like a dream over something that looks like a "dream" but shoots like a nightmare.

Don't fear the gun...fear the one that's wielding it!

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JCL
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Re: kwa usp gas problem

Post by JCL » Wed Sep 10, 2014 11:50 am

What do you mean how am I filling it? I'm using propane.
JG 614 Full stock
S&T TAR 21 metal gearbox
VFC UMP GBB

KWA USP
WE 1911

My youtube channel is ArbiterAirsoft

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Guges Mk3
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Re: kwa usp gas problem

Post by Guges Mk3 » Wed Sep 10, 2014 3:30 pm

You "need' to tell us your process. So:

Are you filling it right side up or upside down.

Are you filling warm or cold mags?

Are you counting when you fill or are you doing it by hearing?

Is your gas source new or used.

All of the above affects how well your gun works.

So..I politely ask again...."how are you filling it".
I rather use a "nightmare" that shoots like a dream over something that looks like a "dream" but shoots like a nightmare.

Don't fear the gun...fear the one that's wielding it!

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JCL
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Re: kwa usp gas problem

Post by JCL » Wed Sep 10, 2014 9:28 pm

I was just confused as to what you were asking.

Upside down

Warm mags

Counting
JG 614 Full stock
S&T TAR 21 metal gearbox
VFC UMP GBB

KWA USP
WE 1911

My youtube channel is ArbiterAirsoft

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JCL
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Re: kwa usp gas problem

Post by JCL » Thu Sep 11, 2014 10:27 am

This morning, after cleaning it up a little bit, I tried to shoot it again and after the first "shot" the slide only went halfway forward. Iracked the slide and it went all the way forward. I took the mag out and a little green section of a rubber ring fell out of the magwell.
JG 614 Full stock
S&T TAR 21 metal gearbox
VFC UMP GBB

KWA USP
WE 1911

My youtube channel is ArbiterAirsoft

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IsparkTheLa
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Re: kwa usp gas problem

Post by IsparkTheLa » Thu Sep 11, 2014 10:14 pm

Where did you get the gun? Is it the system 7 design or the old gas system?
Today's problems cannot be solved if we still think the way we thought when we created them.

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JCL
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Re: kwa usp gas problem

Post by JCL » Thu Sep 11, 2014 10:32 pm

I got it from evike.com. I believe its the ns2
JG 614 Full stock
S&T TAR 21 metal gearbox
VFC UMP GBB

KWA USP
WE 1911

My youtube channel is ArbiterAirsoft

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IsparkTheLa
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Re: kwa usp gas problem

Post by IsparkTheLa » Fri Sep 12, 2014 7:31 am

Return it. Their terms say you have 45 days once the product has been delivered. It just has to pass RMA "inspection." http://www.evike.com/policy.php

If you don't want to deal with the warranty headaches, take the slide off and post some pictures of the blow back unit within the slide. We can try to help you troubleshoot it but, it sounds like you will already need to buy replacement parts for a "new" gun, which always sucks. Just be aware, as stated in Evikes terms, it says if the product has been dismantled the warranty will no longer be offered.
Today's problems cannot be solved if we still think the way we thought when we created them.

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Guges Mk3
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Re: kwa usp gas problem

Post by Guges Mk3 » Fri Sep 12, 2014 9:01 am

JCL wrote:I was just confused as to what you were asking.

Upside down

Warm mags

Counting
Should be cold mags...warm mags do not take gas well. You have to go from HP to Low pressure. A warm mag is not going to have low pressure.

Ideal Gas law in effect here >>>PV=nRT<<<

No Counting...you don't fill a car's gas tank by counting do you? Same applies for Airsoft...you stop filling your gas mag when its full. Put your ear on the tank and listen for the hissing to stop. Counting is for a set procedure...filling a gas mag is never a set procedure. If you mag is warm...more time may be required. If your fill tank is emptying out...more time is required. If you have a clogged/bad fill valve...more time is required. Versus a Frozen mag, perfect fill valve and a full source tank which could fill your GBB mag in 2 seconds. Who ever told you to do fills by a count system....don't listen to them about this anymore...they do not know of what they speak.
JCL wrote:This morning, after cleaning it up a little bit, I tried to shoot it again and after the first "shot" the slide only went halfway forward. Iracked the slide and it went all the way forward. I took the mag out and a little green section of a rubber ring fell out of the magwell.
Pictures help when asking about an issue...there should be anything green falling out of a USP.
I rather use a "nightmare" that shoots like a dream over something that looks like a "dream" but shoots like a nightmare.

Don't fear the gun...fear the one that's wielding it!

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JCL
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Joined: Tue Jun 26, 2012 11:01 pm
Location: Cohasset MN

Re: kwa usp gas problem

Post by JCL » Sat Sep 13, 2014 9:37 pm

What would be helpful to have pictures of?
JG 614 Full stock
S&T TAR 21 metal gearbox
VFC UMP GBB

KWA USP
WE 1911

My youtube channel is ArbiterAirsoft

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JCL
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Re: kwa usp gas problem

Post by JCL » Mon Sep 15, 2014 1:14 am

I found where the green ring pieces came from. The main seal is torn. Im not sure where I'd get another one, though, since its sold out at the kwa store and that's the only place I can find it.
JG 614 Full stock
S&T TAR 21 metal gearbox
VFC UMP GBB

KWA USP
WE 1911

My youtube channel is ArbiterAirsoft

Beta
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Re: kwa usp gas problem

Post by Beta » Sun Sep 21, 2014 2:26 pm

look around online, also call kwa. They dont actively update the website that often, so they sometimes have stock of an item.

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JCL
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Re: kwa usp gas problem

Post by JCL » Sun Sep 21, 2014 3:11 pm

I emailed kwa and I bought the seal. Hopefully that will solve the problem
JG 614 Full stock
S&T TAR 21 metal gearbox
VFC UMP GBB

KWA USP
WE 1911

My youtube channel is ArbiterAirsoft

User avatar
JCL
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Posts: 54
Joined: Tue Jun 26, 2012 11:01 pm
Location: Cohasset MN

Re: kwa usp gas problem

Post by JCL » Wed Sep 24, 2014 3:54 pm

I got the seal in the mail yesterday and it's head and shoulders above the original as far as quality. It completely fixed the problem.
JG 614 Full stock
S&T TAR 21 metal gearbox
VFC UMP GBB

KWA USP
WE 1911

My youtube channel is ArbiterAirsoft

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