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Post by TheEnd on Jul 2, 2011 21:03:39 GMT -5
So, I still have this KWA G17 that refuses to cycle. It acts like a gas powered springer. I fill the mag with gas, rack the slide, a bb shoots out at good FPS and travels quite far, then nothing. I then rack the slide and again it shoots a bb then nothing.
It has new blow back unit springs, a new mag catch, the slide racks like butter and isn't hanging on anything, and I've tried it with the G17 mag and my extended G18 mags. Nothing changes.
I've looked at the KWA parts diagram and everything is there.
Anyone have a clue? I really want this thing to work.
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fuzzywolly
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Post by fuzzywolly on Jul 2, 2011 22:04:28 GMT -5
Just wrote a response, but it must have failed to go through.
Anyways, having the same problem with my HFC m17. Cleaned the hell out of it, slide racks smooth, and get one good shot off before having to pull back the slide again. I thought some new blow back unit springs would solve the problem, but from what you said, that might not be the answer. Perhaps a new nozzle? I also read that a new hammer spring might help, but the thread lacked detail and I never looked into it too much. Any thoughts? Only reason why I have not bought any new parts is because of the fact that I am not sure what needs to be replaced.
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Post by TheEnd on Jul 2, 2011 22:25:01 GMT -5
I have no clue. The symptoms don't really make sense to me. I don't understand how it fires only one shot and doesn't vent the gas. The firing pin pushes the valve open, the slide doesn't move at all yet the firing pin is disconnected to prevent venting. The mechanics don't make sense.
I thought the hammer spring might need replacing, but when I took the hammer out the spring felt pretty strong. I want to replace the hammer spring and firing pin, but I don't want to put more money into this thing and still have it not work.
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fuzzywolly
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Post by fuzzywolly on Jul 2, 2011 22:41:16 GMT -5
Yeah, same here. On the m9, all the gas vents out as something sticks resulting in the gas venting out. But the m17 does not vent its gas.
Is yours firing, but the slide just does not move back? Mine seems to blow back, but extremely softly. That is why I was thinking it needed some new springs for replacement.
I don't want to dish out any cash either, especially when running the risk of it not fixing the problem.
What about a new recoil spring? My thinking was that the old one wore down and could use a new spring. Being only partially GBB educated, I was thinking that perhaps a new, stronger recoil spring would help blow back the slide? It seems on mine that its a soft soft blow back, compared to the past times firing it, when blow back was super quick and clean.
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Post by Mles on Jul 3, 2011 20:02:42 GMT -5
My fucking brand new TM G18c is also doing this. Essentially the hammer is not hitting the valve hard enough - light striking. Solution: Glue plastic pieces to the the output valve until you can stop the light striking.
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Post by Tollis on Jul 3, 2011 20:04:44 GMT -5
Miles, are you using propane in it?
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Post by Mles on Jul 3, 2011 20:32:23 GMT -5
Yes sir, I upgraded the recoil spring also. I think the hammer spring isn't strong enough or something. It was working for a while, but now it is having problems.
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Post by TheEnd on Jul 3, 2011 20:57:14 GMT -5
My first thought was light striking, but the hammer spring feels plenty strong. I'm starting to think maybe the firing pin is worn out. That would sort of explain the light strike with a strong hammer spring.
Looks like either way I'm going to be throwing parts at it until it's fixed.
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Post by Mles on Jul 3, 2011 21:20:50 GMT -5
I just got my pistol working, for some reason the humidity we had today really fucked it up.
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fuzzywolly
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Vegetation is gold
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Post by fuzzywolly on Jul 3, 2011 22:26:12 GMT -5
I just got my pistol working, for some reason the humidity we had today really fucked it up. Wish that was the solution to my problem.  The End, I would dish out some cash for parts as wel and give it a go, but I first have to figure out what is compatible with the HFC model.  If you figure out the problem, make sure to post it here. I will do the same. |
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Post by Knief on Jul 4, 2011 19:08:27 GMT -5
This hot weather causes light strikes on a gun that worked fine all winter and spring. If you have some available, try running some 134a in the gun. The option is use your propane in a well air conditioned environment. If it cycles, you've got light strikes (which, it sounds to me, Miles and fuzzy have for sure).
Your problem is a little more interesting, TheEnd. Have you chronoed the gun? If it's shooting at full power and the slide doesn't cycle at all, then it's unlikely that it's just a light strike. It would seem more like the gas is only being routed out the barrel and not at all in the blow back chamber. In that case, you might need to replace your stem valve or look at how you installed the loading nozzle when you put the new springs in. If anything, try taking the slide apart and rebuilding it. 75% of my GBB problems have been solved by taking the gun apart and putting it back together again. They're finicky beasts, and one mistake can give you some weird behavior.
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Post by TheEnd on Jul 4, 2011 22:11:20 GMT -5
First off, I screwed up a little. I have a G19, not 17. Pretty much the same thing internally.
I've taken it apart about 100 times, no lie. I know for sure the slide is assembled properly. That lead me to believe the frame had something wrong.
I was tinkering with it some more today and I was able to get the slide to cycle. It is shooting at least 300fps so the slide is good. The problem now is that it will blow back, then get stuck on the hammer on the way forward. That lead me to tear down the frame.
After comparing every part to the KWA diagram I found that the firing pin was bent. Looking at the part it looked like it was supposed to be that way, but comparing it to the diagram it is obviously bent. The reason I had no blow back is due to the lack of an external hammer. The internal hammer doesn't carry enough momentum to push the firing pin hard enough to open the valve. Because of this the internal hammer has a cam shape and the firing pin rides the cam instead of being pressed by a hammer.
Because my bent firing pin was riding on a cam, it took very little movement to be reset. Once my hammer pressed the firing pin, the valve opened, blew the slide back the half a millimeter or so it needed to disengage, and everything stopped. Based on what I saw I would HIGHLY suggest KWA/KSC Glock users do not fire the pistol without a mag in it. With the mag in the firing pin face takes the brunt of the impact. Without a mag the thin rear loop takes the impact.
I tried to heat and slowly bend the firing pin back. It is made of pot metal and broke very easily. I'm going to raid the KWA pro shop and rebuild it. I will post back up if that is indeed my problem.
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