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MAG's and hopup


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#1 sputnik

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Posted 22 June 2008 - 08:00 PM

I am having some issues with my KWA M4a1. I originally had the stock hop up and bucking with a classic army 430mm 6.04 tbb just to try it out, then replaced the bucking with Systema and a Prometheus barrell I cut down from a longer one. Now I had also gotten MAG 100 RD mid caps and whenever I try shooting semi right after the mag is loaded.. it jams. It wont fire the first shot, but the second will and usually clear the barrel. Sometimes it will dry fire two or three times before a bb comes out. And the barrel is clean when this is done too. When I go full auto for a burst, it'll shoot fine.. no jams to speak of BUT, the first shot typically will fall out. Now this is only when the mags are near their 100 rd limit... or after. Once about 10~20 rds are fired, the AEG can shoot semi with no problems there after. Also, any high caps, KWA, AMP, Classic Army, and ECHO1 work fine. I've also tried King Arms midcaps and have gotten the same result as the MAG mids.

Edited by sputnik, 22 June 2008 - 08:14 PM.


#2 vic_man4

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Posted 23 June 2008 - 12:01 PM

View Postsputnik, on Jun 22 2008, 09:00 PM, said:

I am having some issues with my KWA M4a1. I originally had the stock hop up and bucking with a classic army 430mm 6.04 tbb just to try it out, then replaced the bucking with Systema and a Prometheus barrell I cut down from a longer one. Now I had also gotten MAG 100 RD mid caps and whenever I try shooting semi right after the mag is loaded.. it jams. It wont fire the first shot, but the second will and usually clear the barrel. Sometimes it will dry fire two or three times before a bb comes out. And the barrel is clean when this is done too. When I go full auto for a burst, it'll shoot fine.. no jams to speak of BUT, the first shot typically will fall out. Now this is only when the mags are near their 100 rd limit... or after. Once about 10~20 rds are fired, the AEG can shoot semi with no problems there after. Also, any high caps, KWA, AMP, Classic Army, and ECHO1 work fine. I've also tried King Arms midcaps and have gotten the same result as the MAG mids.

You might aswell just try greasing your magazine and dont fill it up to its total capacity, fill it only 80-90 shots, try that, it might help you out a bit. And grease your hopup unit to try and prevent jams, but if its overgreased, thats what might be causing that jammage in your barrel.

#3 sputnik

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Posted 23 June 2008 - 07:39 PM

View Postvic_man4, on Jun 23 2008, 04:01 PM, said:

You might aswell just try greasing your magazine and dont fill it up to its total capacity, fill it only 80-90 shots, try that, it might help you out a bit. And grease your hopup unit to try and prevent jams, but if its overgreased, thats what might be causing that jammage in your barrel.
Yea, I'm not sure about overgreasing them. There was jamming pre grease and post grease. If I do load 40 bb's it'll work fine (did it at a game sunday). I think the mag when fully loaded, the spring gets  too compressed and attepts to force too many bb's at once on semi, of course, when I tried a team mates mag, whom I've never met, the jamming still occured with his king arms.

#4 sputnik

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Posted 25 June 2008 - 06:52 AM

Just for an update, I took out my Prometheus barrel and put in the old stock KWA barrel with the Systema bucking. After cleaning the barrel I took it down in my basement and only had the MAG midcap jam a couple times (It was filled up to its 100rd limit). Then this morning The only double fired twice with a random jam 30rds in (didnt spray silicone in barrel) and proceeded to empty the mag with no more problems..

It could be a couple things, I'm getting a new hop up and bucking to do some more tests this weekend.

Edited by sputnik, 25 June 2008 - 06:52 AM.


#5 vic_man4

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Posted 25 June 2008 - 10:02 AM

View Postsputnik, on Jun 25 2008, 07:52 AM, said:

Just for an update, I took out my Prometheus barrel and put in the old stock KWA barrel with the Systema bucking. After cleaning the barrel I took it down in my basement and only had the MAG midcap jam a couple times (It was filled up to its 100rd limit). Then this morning The only double fired twice with a random jam 30rds in (didnt spray silicone in barrel) and proceeded to empty the mag with no more problems..

It could be a couple things, I'm getting a new hop up and bucking to do some more tests this weekend.

Also make sure that you dont have a excess amout of hopup. That could also jam the gun. Try turning the hopup entirely off and then readjusting it. You might have better luck.

P.S. What type of BB are you using???

Edited by vic_man4, 25 June 2008 - 10:10 AM.


#6 sputnik

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Posted 25 June 2008 - 05:26 PM

View Postvic_man4, on Jun 25 2008, 02:02 PM, said:

Also make sure that you dont have a excess amout of hopup. That could also jam the gun. Try turning the hopup entirely off and then readjusting it. You might have better luck.

P.S. What type of BB are you using???
The hop was on a slight bit, then shut off. I'm also using KSC perfect .25's.

#7 rdlu62

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Posted 26 June 2008 - 08:21 AM

I have the same experience with my M4A1 and M4 Tactical when I top off my G&G 79rd midcap magazine. What I do is load lesser BB's. There's probably too much tension on the magazine's spring initially when it's topped off and it tends to push too many BB's at once in the chamber.

I am not an expert and this is just based on my experience. Please correct me if I'm wrong.

Edited by rdlu62, 26 June 2008 - 08:27 AM.


#8 vic_man4

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Posted 26 June 2008 - 02:03 PM

View Postrdlu62, on Jun 26 2008, 09:21 AM, said:

I have the same experience with my M4A1 and M4 Tactical when I top off my G&G 79rd midcap magazine. What I do is load lesser BB's. There's probably too much tension on the magazine's spring initially when it's topped off and it tends to push too many BB's at once in the chamber.

I am not an expert and this is just based on my experience. Please correct me if I'm wrong.

I think you hit the nail on the head there ;)

#9 Doctor Kajita

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Posted 26 June 2008 - 10:59 PM

View Postrdlu62, on Jun 26 2008, 09:21 AM, said:

I have the same experience with my M4A1 and M4 Tactical when I top off my G&G 79rd midcap magazine. What I do is load lesser BB's. There's probably too much tension on the magazine's spring initially when it's topped off and it tends to push too many BB's at once in the chamber.

I am not an expert and this is just based on my experience. Please correct me if I'm wrong.

I guess I have the same issue with the G&G.  I think the spring needs to be broken in too.  A combination of both putting less BB's in and just using them over time might be the answer.  Also, lubing the mag might help too.  For me, it would dry fire at least 3 - 5 times before a bb would plop out and then I'd get a burst of about 3 at once, then it would fire normal.  Really annoying.

#10 sputnik

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Posted 27 June 2008 - 10:29 AM

View Postrdlu62, on Jun 26 2008, 12:21 PM, said:

I have the same experience with my M4A1 and M4 Tactical when I top off my G&G 79rd midcap magazine. What I do is load lesser BB's. There's probably too much tension on the magazine's spring initially when it's topped off and it tends to push too many BB's at once in the chamber.

I am not an expert and this is just based on my experience. Please correct me if I'm wrong.
I thought the same thing. It's more than likely, so breaking it in and giving it time is probably the best option.

#11 clownowar

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Posted 08 July 2008 - 02:33 PM

View Postsputnik, on Jun 23 2008, 12:00 AM, said:

I am having some issues with my KWA M4a1. I originally had the stock hop up and bucking with a classic army 430mm 6.04 tbb just to try it out, then replaced the bucking with Systema and a Prometheus barrell I cut down from a longer one. Now I had also gotten MAG 100 RD mid caps and whenever I try shooting semi right after the mag is loaded.. it jams. It wont fire the first shot, but the second will and usually clear the barrel. Sometimes it will dry fire two or three times before a bb comes out. And the barrel is clean when this is done too. When I go full auto for a burst, it'll shoot fine.. no jams to speak of BUT, the first shot typically will fall out. Now this is only when the mags are near their 100 rd limit... or after. Once about 10~20 rds are fired, the AEG can shoot semi with no problems there after. Also, any high caps, KWA, AMP, Classic Army, and ECHO1 work fine. I've also tried King Arms midcaps and have gotten the same result as the MAG mids.

had some of the same trouble with that brand of mag's before. you got to spray a little silicon down the hole every couple of months to keep them running right. then i would put in a new bucking, that double feed/dribble thing is usually a worn, oily, or mis-packed bucking in my experience.

#12 DaTigah

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Posted 12 July 2008 - 06:33 PM

View Postsputnik, on Jun 25 2008, 09:26 PM, said:

The hop was on a slight bit, then shut off. I'm also using KSC perfect .25's.

KSC bb's? I know they are good until I found something a lil disturbing. Do me a favor, would you carefully look for KSC bb's in your bag that are poorly rid of visible seems and injection nips. That could be another factor to the misfeeding or jamming problem you have there because recently I bought 3 bags of new KSC .20s and inspected them. To my surprise, there were some that didnt look "perfect" at all. :(




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