KSC USP Problem for buyer

dpvu · February 10th, 2009, 01:29

I shipped this gun about a week ago and before I did I put about 2 mags through it (to test and say goodbye). However, the buyer has had some problems with it I can't seem to explain because I've never had them. Basically they're as follows:

"Basically, I gas up the mag, put it in, rack the slide and...nothing. However, if I take the slide off, put it back on, it'll fire fine. As soon as I rack it again though, it stops working...

This happens with both mags. Also, my friend has the same gun, and the mags works fine in his.

So, we frankensteined them together and there seems to be a problem with the firing pin."

Anyone got an explanation. Maybe just some oil and TLC?

Gerkraz · February 10th, 2009, 09:06

Just to clarify, I'm the "friend with the USP"

What he meant by "frankensteined them together" is that we used his slide and spring on my frame, and it had the same issue. His frame and spring with my slide works flawlessly.

We tried all the permutations and it is definitely a problem occuring with the slide.

Since the gun is not firing, and I can't hear any gas being released when we pull the trigger, it must mean that the firing pin isn't actually reaching the gas release...

Splashx · February 10th, 2009, 13:03

is the trigger broke? take off the slide and watch for moving plate when pressing the trigger. If nothing's movin', the trigger is broken

Gerkraz · February 10th, 2009, 13:44

No it is not broken.

His trigger works fine with my slide.

dpvu · February 10th, 2009, 18:09

That's odd... isn't the firing pin on the frame? The slide only contains the blowback chamber and nozzle. Perhaps it's being blocked somehow by my slide. Try oiling up the hammer and firing pin area.

swatt13 · February 10th, 2009, 18:52

ive seen this happen a few times, even to me. i always test fire before i ship just so incase the seller tries to pull a fast one and say it doesnt work, i can tell him to take a flying leap. unfortunatly it does happen. the shipping process can be very vigerous and detrimental to the item, and can cause damage providing the item isnt adaquetly packaged (and there is no way to tell how adaquet, adaquet is). this is an unfortunate situation, if you have a very good trader rateing you have that to back you up (there are people out there to screw you), but without you kinda need to go the extra mile and help resolve the problem.

luckily gekraz has a good trader rateing so you can rest assured your not being taken advantage of.

Styrak · February 10th, 2009, 18:52

Yup hammer/pin whatever you want to call it is in the frame.

So no sound, no movement, nothing? trigger just clicks?

Iyonjin · February 10th, 2009, 19:48

Ok, I just want to assure you all that I am in no way trying anything sketchy here. The gun is lovely aside from the fact that I cannot seem to get it to fire and I want nothing more than to make it work

I lack Gerk's level of feedback, but I feel confident that he will vouchsafe my conduct in this matter.

Anywho, I just spent another hour or so taking the gun apart with its directions et al on hand. I think, for all that I am inexpert, that the "firing pin" which is supposed to hit the gas release on the mag is resting at an angle and thus not impacting with anywhere near the force required to fire. I'm going to get a look at Gerk's USP tomorrow to confirm. The trigger is working fine but that part is not.

dpvu · February 10th, 2009, 20:15

I'm in no way accusing Iyonjin of trying to pull a fast one. All my communications with him have been smooth and as I said, I did test fire a full mag (using both mags) before I shipped her off. While this USP had some issues (trigger broke on old frame, slide doesn't lock back due to enhanced springs and metal slide and the hopup is a bit warn), I was very upfront with them. This was not an issue I had encountered before with this gun which is why it puzzles me so much.

The "firing pin" is supposed to rest at an angle when you first insert the mag. You can see this if you take the slide off. However, it is my understanding that racking the slide "sets" the firing pin and allows the gun to fire. Unlike say a Glock, which will fire the first time if the hammer is back, the USP requires the slide to be racked at least the first time (chambering a round and setting the firing pin). The problem lies in the slide so I'm thinking it's somehow interfering with the firing pin being set.

I'm trying to figure out how taking the slide off fixes the problem then racking it re-initiates it. However, it's hard for me to troubleshoot as I'm not a gun doc and don't have the actual gun in front of me.

dpvu · February 10th, 2009, 23:28

That could explain the problem. Check that the blowback unit is as high as possible. I know it's a mess because the screw stripped.

To the buyer: It worked fine for me when the deep groove I dremelled in there lines up. That's as tight as I could get the screw. If it's lined up, then try a generous application of silicone, especially in that firing pin area. I do remember the nub that Tys is talking about. Ensure that is not stuck as well.

Iyonjin · February 12th, 2009, 08:29

So Tys had it pretty much spot on. The trigger is live and is not completing the cycle full enough to trip the sear.

Part 57 (the decockcing bar) is not operating properly (it moves, but not correctly) and the knocker is only retracting partially. Though I am not sure why. I have started the process of dissasembly but I cannot seem to get the lower frame out of the gun to try and get it all working again. (I'm still very new to airsoft, let alone GBB pistols.)

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February 10th, 2009, 01:29	#1
dpvu Trader rating Join Date: Mar 2008 Location: Calgary	KSC USP Problem for buyer I shipped this gun about a week ago and before I did I put about 2 mags through it (to test and say goodbye). However, the buyer has had some problems with it I can't seem to explain because I've never had them. Basically they're as follows: "Basically, I gas up the mag, put it in, rack the slide and...nothing. However, if I take the slide off, put it back on, it'll fire fine. As soon as I rack it again though, it stops working... This happens with both mags. Also, my friend has the same gun, and the mags works fine in his. So, we frankensteined them together and there seems to be a problem with the firing pin." Anyone got an explanation. Maybe just some oil and TLC? __________________ JG HK416 KWA USP

February 10th, 2009, 18:09	#5
dpvu Trader rating Join Date: Mar 2008 Location: Calgary	That's odd... isn't the firing pin on the frame? The slide only contains the blowback chamber and nozzle. Perhaps it's being blocked somehow by my slide. Try oiling up the hammer and firing pin area. __________________ JG HK416 KWA USP

February 10th, 2009, 18:52	#7
Styrak Trader rating Join Date: Jan 2007 Location: Saskatoon, SK	Yup hammer/pin whatever you want to call it is in the frame. So no sound, no movement, nothing? trigger just clicks? __________________ Airsoft Sales and Repair/Upgrade Services

February 10th, 2009, 09:06	#2
Gerkraz Trader rating Join Date: Dec 2004 Location: St. John's, Newfoundland	Just to clarify, I'm the "friend with the USP" What he meant by "frankensteined them together" is that we used his slide and spring on my frame, and it had the same issue. His frame and spring with my slide works flawlessly. We tried all the permutations and it is definitely a problem occuring with the slide. Since the gun is not firing, and I can't hear any gas being released when we pull the trigger, it must mean that the firing pin isn't actually reaching the gas release...

February 10th, 2009, 13:03	#3
Splashx Trader rating Join Date: May 2007 Location: Near Quebec city	is the trigger broke? take off the slide and watch for moving plate when pressing the trigger. If nothing's movin', the trigger is broken

February 10th, 2009, 13:44	#4
Gerkraz Trader rating Join Date: Dec 2004 Location: St. John's, Newfoundland	No it is not broken. His trigger works fine with my slide.

February 10th, 2009, 19:48	#8
Iyonjin Trader rating Join Date: Oct 2008 Location: St. John's, NL	Ok, I just want to assure you all that I am in no way trying anything sketchy here. The gun is lovely aside from the fact that I cannot seem to get it to fire and I want nothing more than to make it work I lack Gerk's level of feedback, but I feel confident that he will vouchsafe my conduct in this matter. Anywho, I just spent another hour or so taking the gun apart with its directions et al on hand. I think, for all that I am inexpert, that the "firing pin" which is supposed to hit the gas release on the mag is resting at an angle and thus not impacting with anywhere near the force required to fire. I'm going to get a look at Gerk's USP tomorrow to confirm. The trigger is working fine but that part is not.

February 10th, 2009, 20:15	#9
dpvu Trader rating Join Date: Mar 2008 Location: Calgary	I'm in no way accusing Iyonjin of trying to pull a fast one. All my communications with him have been smooth and as I said, I did test fire a full mag (using both mags) before I shipped her off. While this USP had some issues (trigger broke on old frame, slide doesn't lock back due to enhanced springs and metal slide and the hopup is a bit warn), I was very upfront with them. This was not an issue I had encountered before with this gun which is why it puzzles me so much. The "firing pin" is supposed to rest at an angle when you first insert the mag. You can see this if you take the slide off. However, it is my understanding that racking the slide "sets" the firing pin and allows the gun to fire. Unlike say a Glock, which will fire the first time if the hammer is back, the USP requires the slide to be racked at least the first time (chambering a round and setting the firing pin). The problem lies in the slide so I'm thinking it's somehow interfering with the firing pin being set. I'm trying to figure out how taking the slide off fixes the problem then racking it re-initiates it. However, it's hard for me to troubleshoot as I'm not a gun doc and don't have the actual gun in front of me. __________________ JG HK416 KWA USP Last edited by dpvu; February 10th, 2009 at 20:17..

February 10th, 2009, 23:28	#10
dpvu Trader rating Join Date: Mar 2008 Location: Calgary	That could explain the problem. Check that the blowback unit is as high as possible. I know it's a mess because the screw stripped. To the buyer: It worked fine for me when the deep groove I dremelled in there lines up. That's as tight as I could get the screw. If it's lined up, then try a generous application of silicone, especially in that firing pin area. I do remember the nub that Tys is talking about. Ensure that is not stuck as well. __________________ JG HK416 KWA USP

February 12th, 2009, 08:29	#11
Iyonjin Trader rating Join Date: Oct 2008 Location: St. John's, NL	So Tys had it pretty much spot on. The trigger is live and is not completing the cycle full enough to trip the sear. Part 57 (the decockcing bar) is not operating properly (it moves, but not correctly) and the knocker is only retracting partially. Though I am not sure why. I have started the process of dissasembly but I cannot seem to get the lower frame out of the gun to try and get it all working again. (I'm still very new to airsoft, let alone GBB pistols.)

KSC USP Problem for buyer

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