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Hop Up Issues


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#1 ThatGuy34

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Posted 11 January 2014 - 02:19 PM

The Hop up in my Kwa sr7 doesn't seem to be working. Any help?

Edited by ThatGuy34, 11 January 2014 - 02:19 PM.


#2 Larry

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Posted 11 January 2014 - 02:35 PM

Just bought a sr10,  put 1000 rounds thru it (.30) . Cleaned barrel carefully with rubbing alcohol with hop up turned off before use. The hop can barely lift the .30s, works well with .25s can adjust to  over hop them or under hop, so know I have some hop up working there. Seems pretty weak for a 400$ gun. Normal? Need break in? . My 1 year old  CA that was going to be my new back up is flat hopped with  prommy stainless, shaved prommy purple and prommy bridge tensioner and gets out there. Not a newb. Will this hop break in or do I need to replace it to handle .30s

Edited by Larry, 11 January 2014 - 03:34 PM.


#3 Larry

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Posted 11 January 2014 - 02:39 PM

Also when trying to axcess the barrel,  with back pin removed will not lift up easly. Did fire on semi first. Didnt want to force it. Is it just tight because its new and have to pull up harder on it ?

#4 ThatGuy34

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Posted 11 January 2014 - 02:41 PM

View PostLarry, on 11 January 2014 - 02:39 PM, said:

Also when trying to axcess the barrel,  with back pin removed will not lift up easly. Did fire on semi first. Didnt want to force it. Is it just tight because its new and have to pull up harder on it ?
Yes, it is supposed to be a bit hard the first few times you open it.

#5 Larry

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Posted 11 January 2014 - 02:50 PM

Ok, didnt want to have to go thru releasing the AR, will try it with a little more force. Need to get a look at that hop up, may have some trash on it. Thanks

Edited by Larry, 11 January 2014 - 03:34 PM.


#6 Larry

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Posted 11 January 2014 - 02:56 PM

Did you take your barrel out and check out your bucking and nub, alignment, was it clean ?

#7 ThatGuy34

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Posted 11 January 2014 - 03:42 PM

View PostLarry, on 11 January 2014 - 02:56 PM, said:

Did you take your barrel out and check out your bucking and nub, alignment, was it clean ?
What are the two little hop up nub things supposed to look like when you look down the barrel? and yes, I put the bucking in warm soapy water twice.

#8 Larry

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Posted 11 January 2014 - 06:19 PM

Google kwa bucking and look at images, lots of good pics. I know when I shine a light in my barrel I  do see the little  "fangs" sticking into the barrel . So the bucking may have some greese on it .  Been watching football, will try to get barrel out latter and have a look.

Edited by Larry, 11 January 2014 - 06:58 PM.


#9 Jesse Hammil

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Posted 11 January 2014 - 07:36 PM

Brand new kwa aegs have a lot of grease and oil. Take out the bucking and wash it with warm soapy water. Clean the barrel. My ris needed to be washed 4 times or so before the grease stopped getting in there. Also make sure your bucking "fins" are protruding into the barrel as you adjust the hop. They should be even.

I fond out of the Box I had trouble with .28 BBS. Sticking a wire in the nub helped a ton.

#10 ThatGuy34

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Posted 12 January 2014 - 07:19 AM

View PostJesse Hammil, on 11 January 2014 - 07:36 PM, said:

Brand new kwa aegs have a lot of grease and oil. Take out the bucking and wash it with warm soapy water. Clean the barrel. My ris needed to be washed 4 times or so before the grease stopped getting in there. Also make sure your bucking "fins" are protruding into the barrel as you adjust the hop. They should be even.

I fond out of the Box I had trouble with .28 BBS. Sticking a wire in the nub helped a ton.
What nub are you talking about?

#11 Jesse Hammil

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Posted 12 January 2014 - 10:55 AM

The nub is the little round tube that sits in the hop up chamber. Its between the bucking and the hop arm. The nub is what pushes the fins into the barrel.  Putting a wire in it makes it less squishy,therefore more responsive.

Just trimming it (very slightly) so that it fits in the barrel window and sticking a wire in it had good results with .28 BBS.

On a side note, I have been experimenting with buckings and nubs. I'm currently using a maple leaf 75d with a gruader nub with a wire in it and have really good accuracy and range with .28s.

Edited by Jesse Hammil, 12 January 2014 - 10:58 AM.


#12 Jesse Hammil

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Posted 12 January 2014 - 10:56 AM

Double post.

Edited by Jesse Hammil, 12 January 2014 - 10:58 AM.


#13 Larry

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Posted 12 January 2014 - 06:02 PM

Really, on a new 350 dollar gun you have to tech it to get it to work, even have to take it apart. Why spend that much on a gun that is supposed to be ready out of the box. Most new guns u just have to  carefully clean the barrel in the gun(did 2x). Took my gun to georgetown today to try it for the second time (second sr10, took first one back for no hopup at all),  hop up was so loose it would back off after 10 shots. The guys at the store tried to tighten it, guys at feild that have sr10s, and myself. Got ticked off. Started to loosen it and tighten it today 1/2 dozen times. Thought it might break. Finnaly started to tighten down. After a couple more midcaps over the lake started working fine and held adjustment for the rest of the day. Guess the oil or whatever woked its way out, 2k rounds aprox. Not impressed. Did shoot good for the rest of the day. Hope I wont regret swaping it for the VFC when they gave me the chance.

Edited by Larry, 12 January 2014 - 06:11 PM.


#14 Larry

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Posted 12 January 2014 - 06:36 PM

How long have u owned it? Would suggest you return it to where u bought it, Guy34. They should be able to help if the purchase is recent.

Edited by Larry, 12 January 2014 - 07:09 PM.


#15 vanevery

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Posted 12 January 2014 - 07:11 PM

View PostLarry, on 12 January 2014 - 06:02 PM, said:

Really, on a new 350 dollar gun you have to tech it to get it to work, even have to take it apart. Why spend that much on a gun that is supposed to be ready out of the box. Most new guns u just have to  carefully clean the barrel in the gun(did 2x). Took my gun to georgetown today to try it for the second time (second sr10, took first one back for no hopup at all),  hop up was so loose it would back off after 10 shots. The guys at the store tried to tighten it, guys at feild that have sr10s, and myself. Got ticked off. Started to loosen it and tighten it today 1/2 dozen times. Thought it might break. Finnaly started to tighten down. After a couple more midcaps over the lake started working fine and held adjustment for the rest of the day. Guess the oil or whatever woked its way out, 2k rounds aprox. Not impressed. Did shoot good for the rest of the day. Hope I wont regret swaping it for the VFC when they gave me the chance.
Drop in a G&G Green bucking, use quality .30's, and you will forget VFC ever existed.

Edited by vanevery, 12 January 2014 - 07:12 PM.


#16 Larry

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Posted 12 January 2014 - 07:43 PM

Worked great today after putting more GB .25s thru it and getting hopup tightened down. Almost 200ft torso hits with tad bit of overhop, impressed with that. Gun could not handle my bioval .30s eariler this week. Hope the oil, or grease is worked out and will try the .30s again in a couple of days. Really heard good things about the kwa bucking, want to give it a chance. Do have a G&G in my parts box and will take your advise after giving the stock one a go. Thanks

Edited by Larry, 12 January 2014 - 08:14 PM.


#17 Chuck S

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Posted 13 January 2014 - 03:37 AM

I've found the gearbox will expel some grease when the gun is new.  Oil soaked bucking is very common and will prevent the hopup from working as intended.  Clean but do not lube the barrel and "chamber" (the bucking).  It may be necessary to soak the bucking in a very mild dish washing (not dishwasher) detergent solution to get rid of all the oil.

-- Chuck




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