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Usp Tactical Ns2 Dry Firing And Having Slide Lock Problems

problem help slide lock misfeed misfire ns2 tactical usp technical

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#1 Rivershark

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Posted 23 March 2012 - 12:07 PM

Ok, so I got a USP Tactical NS2 with two spare mags for Christmas. The same day I got it, the trigger sear broke and it became a paper weight. But I did not falter, for it was under warranty! After sending it to KWA for repairs it seemed fixed. Now, I live in northern New York, so I didn't really have too much oppurtunity to test this gun because it was always really cold out. So I loaded it, leaned out my back door, fired it a few times and was like "Heh, it shoots! Good!". I used it for training purposes a couple times a month over the winter, which is when I started to notice problems. On one occasion it would dry-fire, and the slide wouldn't lock back. After a bit of silicon lube the problem went away, but that might have just been a coincidence.

    Now, however, spring has arrived and I brought out my USP to tune the hop-up and sight it in. This is where the realization that there's a problem really sets in. When firing through a magazine, the gun will randomly dry fire. By this, I mean the gas would go "pop", the slide would cycle, but no BB would fire out of the barrel. It seems very random as to when this happens. It usually happens at least once every 10 rounds though, and one time the gun consistently dry fired every other round all the way through a 20 round mag. And when a mag runs out it gets even worse. The slide NEVER EVER, EVER locks back after firing the last round. I fire the last round, and the slide goes forward like normal, then I can fire again which will be a dry fire, and this dry fire will lock the slide back. Sometimes it takes more than one dry fire to get the slide to lock. I often dry fire it 3-4 times after the last round has been fired before the slide will lock back properly.

    While I'm here, one of my mags also spews gas violently whenever I try to fill it, but it still retains some of the gas and subsequently is still usable (if barely). How can I fix this?

    Now back to the main problem of the dry firing and slide not locking. If I had to guess a reason for this, I would say that the level of gas released per shot is inconsistent, and that it is sometimes not enough to load another round/lock the slide. It does this with all three of my mags so it's not a mag problem.

    I really don't want an answer like "buy new valves for all of your mags", though I may get one anyways. I've already spent enough time and effort on this gun to expect it to work well, and it is still nothing compared to my 1911 made by another certain brand off GBB airsoft manufacturer. I just want to know what I can do to fix my beloved gun, as the season is just starting and I don't want to be bogged down with crappy gun problems while everyone else gets to go out and play.

#2 KWChris

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Posted 24 March 2012 - 06:51 PM

First I would say try taking a q-tip to the magazine(s) in question. If you can clean out Any greases/lubes and especially any tiny granules if anything; be it dust,sand, hair, etc, all of these may be contributing to the feeding/dry fire problem.

As for the slide, I haven't experienced that before, I'd imagine taking the pistol apart a good cleaning and re-lubrication of the guns rails, and Possibly lubing the recoil spring guide would help with the locking problem.

#3 gcw360

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Posted 25 March 2012 - 05:47 AM

The mag "spews gas violently whenever I try to fill it" is because the fill valve o-ring is missing or damaged.  You can buy new o-rings through the Pro Shop.  http://store.kwausa....-ring4pack.aspx

I think that KWChris has given sound advice regarding your USP.  Strip it, clean it, lube it, reassemble and test.  Use the lube that came with the gun.  Not spray silicone.  If you need help with maintenance look in the DYI section of the Forums for the GBB maintenance 1 and 2 video.  Lastly, what bb's are you using.  Feed issues can be caused by the BB being used.

#4 KWChris

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Posted 25 March 2012 - 10:15 AM

Yes! Pretty good ones i missed there, thank you gcw. Definitely use the lube that came with it, and i certainly notice in my tactical that it seems very picky with bb's. A couple different field bought bb's refused to shoot more than 3-5 before dry firing while ksc's refuse to stay in the mag ;)

#5 Outlaw1995

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Posted 25 March 2012 - 06:54 PM

View PostKWChris, on 25 March 2012 - 10:15 AM, said:

Yes! Pretty good ones i missed there, thank you gcw. Definitely use the lube that came with it, and i certainly notice in my tactical that it seems very picky with bb's. A couple different field bought bb's refused to shoot more than 3-5 before dry firing while ksc's refuse to stay in the mag ;)
By stay in the mag, what do you mean? Sometimes when I extract my magazine, one bb flies randomly out of the magazine and once the magazine is out of the mag well, a bb magically falls out as well... is this what you mean?

#6 gcw360

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Posted 25 March 2012 - 07:49 PM

I think he means that KSC BB's worked?  Which would mean KWA BB's works since they are the same.

#7 KWChris

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Posted 25 March 2012 - 10:17 PM

Yeah i was vague. With lesser quality bb's I've experienced them just not feeding up and out of the magazine resulting in the dry fire. And yes the kwa bb's have had no problem feeding the entire magazine, may it be the tactical mag included with it, or match magazines used in it.

Edited by KWChris, 25 March 2012 - 10:19 PM.


#8 Outlaw1995

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Posted 26 March 2012 - 05:08 AM

In terms of the gun not be able to cycle and resulting in dry firing, I think there's a few ways to get it fixed. My friend had the same problem, he destroyed his hop up bucking to find the problem. The issue is either the loading ramp, the jet nozzle that feeds the bbs from the magazine into the loading ramp and slides them into the gun, or the hop up bucking being too tight... Do bbs actually load into the barrel but not fire, and then roll out of the end of the barrel after a few shots? Or do they not even feed into the gun at all?

As for your leak, I'm sorry to say it, but you are going to need to buy new valves. It's the unavoidable and inevitable thing that must be done to fix GBB magazines... :/

#9 Rivershark

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Posted 26 March 2012 - 04:32 PM

View PostOutlaw1995, on 26 March 2012 - 05:08 AM, said:

In terms of the gun not be able to cycle and resulting in dry firing, I think there's a few ways to get it fixed. My friend had the same problem, he destroyed his hop up bucking to find the problem. The issue is either the loading ramp, the jet nozzle that feeds the bbs from the magazine into the loading ramp and slides them into the gun, or the hop up bucking being too tight... Do bbs actually load into the barrel but not fire, and then roll out of the end of the barrel after a few shots? Or do they not even feed into the gun at all?

As for your leak, I'm sorry to say it, but you are going to need to buy new valves. It's the unavoidable and inevitable thing that must be done to fix GBB magazines... :/

The valves aren't a problem because coincidentally those are the one repair part I have on hand (bought some last order I made from the pro shop :D ) The BBs are not rolling out of the barrel, they are simply not transferring from the magazine to the chamber every time. I am using Matrix .25g BBs right now (I know I know I know!), I'll try and dig out some other brands I might have to test with, but I don't buy KSCs so I won't be able to test with those.

I will clean it thoroughly and report back.

EDIT: I cleaned it tediously and applied a lot of TLC and tested it. On the first mag the slide locked back early in the middle of the mag, then worked fine. Next 2 or so mags went fine. After that though the slide not locking back problem returned and stayed for the duration of the tests. No dry firing that I can see, but the slide problem is still there. What do?

Edited by Rivershark, 26 March 2012 - 05:45 PM.


#10 VictorNica

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Posted 28 March 2012 - 10:39 AM

It sounds like the magazine could be getting too cold if the slide locked back for the first two magazines. Even if it's warm outside the magazine gets cold as you use it. If you were using the same magazine back to back to test it, it's not unusual for the slide to stop locking back. Let the magazine warm up each time you test it to rule that out as a possibility.

#11 Rivershark

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Posted 27 April 2012 - 06:11 PM

Long overdue update:

This gun is still crapping out on me. Best case scenario, the gun fires all the rounds but the slide doesn't lock back. What usually happens though is that it dry-fires every other round, and it doesn't lock back. It seems that any problems that were fixed by my meticulous cleaning job just arose again after I put a couple mags through the gun. And after the problems I had right out of the box I sent this in for repairs and it was declared fixed! I really want to like this gun, it wasn't cheap, and it looks nice, but I think this might be the last KWA I ever buy.

Is there anything that can be done to make this gun function? I'm not sending it in because the warranty is expired, and the $45 plus shipping could just be put toward a pistol that does it's job. Any small magical replacement parts? Any modifications? even any insight into what specifically is causing the dry-firing?

#12 Outlaw1995

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Posted 27 April 2012 - 08:18 PM

Sorry to hear you're having issue after issue. I think now, if it hasn't been replaced so far is the bb follower. Perhaps your follower is damaged and if the piece is damaged, your slide lock won't engage on the last shot. Here's a link:
http://store.kwausa....y102110111.aspx

You can get free shipping by using the coupon code: "freeship" on your order as long as your order contains merchandise that equals a total of $30 or more.

#13 Rivershark

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Posted 28 April 2012 - 06:07 AM

I don't think that's it, because the problem persists across the three magazines that I have, which either means that A.) all three followers are broken or B.) it is some other problem. Any other parts that could be the culprit? It's gotta be something on the gun, because there is no difference depending on which magazine I test it with.

Edited by Rivershark, 28 April 2012 - 06:08 AM.


#14 Outlaw1995

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Posted 28 April 2012 - 09:51 AM

View PostRivershark, on 28 April 2012 - 06:07 AM, said:

I don't think that's it, because the problem persists across the three magazines that I have, which either means that A.) all three followers are broken or B.) it is some other problem. Any other parts that could be the culprit? It's gotta be something on the gun, because there is no difference depending on which magazine I test it with.
Ok... so I'm not the end all expert in the USP area, (I don't own one yet) but I have used it enough to get a sense of what parts may be broken... if you could examine these parts below and see if any are broken:

http://store.kwausa....stopspring.aspx
http://store.kwausa....5slidestop.aspx

My main feeling is that the top most link may be the part that is broken for you...

#15 Rivershark

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Posted 30 April 2012 - 11:56 AM

I don't think it is either, because the slide lock problems aren't even the biggest issue. It dry fires every other shot, so I'm assuming it has some sort of feeding problem. Does anyone know what part could cause this?

#16 niko_gpsy

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Posted 30 April 2012 - 01:37 PM

The feeding problems can be from a gun not cycling completely.  But check your loading nozzle for damage and also your bucking to see if it looks swollen from maybe silicone use.  That is the area you can check first then move to the magazine feed lip.





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