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SR-10 2GX hop up and bucking

sr-10 2GX hop up bucking

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#1 check_six

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Posted 02 February 2013 - 07:26 PM

First off I would like to say that I have found A LOT of very useful information on the KWA forums and decided to join since I am getting into airsoft . Now on to the real question :Iknow: ....I recently purchased a KM4-SR10 (2013 version I think?) and I have put around 1200 rounds through the gun, and I am experiencing the same accuracy and range problems that many people have posted about throughout the forums. I have cleaned my inner barrel and bucking twice so far, and my only issue is that my hop-up seems to be completely ineffective when I use heavier bbs. Whenever I shot .20g Lancer Tactical competition grade bbs I was able to over hop the bbs, but not much, and when shooting Extreme Precision .28g bbs I was not able to get the bbs to over hop at all, or to go further than 100 feet before diving into the ground. After the second cleaning I decided to use King Arms Platinum Series .25 bbs since I figured the heavier .28 bbs just weren't spinning well. I had the same result as the .28's and could not apply an effective hop to the .25 bbs either. The strangest part to me is that I was EASILY outranging the .25g and .28g bbs with the .20g bbs and that was with the hop-up set in the "optimal" position for each bb. I would also like to note that after the second cleaning the .20g bbs would not over hop very much. I am wondering if things will smooth out eventually after cleaning and break in, or if the strange inconsistencies could be due to problems with my bucking or the function of my nub. I REALLY want this gun to perform well, but even the first few shots after cleaning still resulted in poor range and accuracy.

I would also like to add that when I tried to measure the diameter of my inner barrel with my calipers I was measuring 5.98-6.00mm, which seemed odd, but was possibly due to my calipers being messed up? The stock kwa polymer magazine that I received also has a little wobble to it, but I don't know if that would affect the hop up performance.

#2 vanevery

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Posted 02 February 2013 - 09:04 PM

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#3 check_six

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Posted 03 February 2013 - 04:55 PM

First off I would like to say thanks to vanevery for the info in the pm. I cleaned my barrel and bucking a third time last night with both soap and alcohol. When I fired it today with the .28g Extreme Precision bbs I was surprised to see that I was able to apply hop to the bbs. I was consistently hitting within an 8" diameter from 80 feet on both semi and full, and I was hitting a 1'x2' target at 130 feet about 6/10 shots on semi. I will say that it was cold and very windy while I was shooting so I wasn't to focused on precise accuracy and probably could have obtained better results with a gun bench. My only questions now are what would be the best upgrades other than the bucking to improve accuracy, and are the groupings that I achieved consistent with what any of you have experienced. I want to increase my range as much as possible without an r-hop and I am also going to put in an SP130 spring so any suggestions for a hard type bucking are appreciated.

#4 kwaispro727

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Posted 03 February 2013 - 06:17 PM

G&G green bucking.  Though my SR10 is handled a 210% spring just fine with the stock bucking, I put the green in.  I will test more extensively next weekend.  Side note:  Your accuracy will increase a little as you break in the gun, the inner barrel actually adjusts by itself or something I forget the exact name.

#5 vanevery

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Posted 03 February 2013 - 06:37 PM

If you can, use .30 bb's.
Better Accuracy and more Range.

#6 gcw360

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Posted 03 February 2013 - 07:10 PM

View Postkwaispro727, on 03 February 2013 - 06:17 PM, said:

G&G green bucking.  Though my SR10 is handled a 210% spring just fine with the stock bucking, I put the green in.  I will test more extensively next weekend.  Side note:  Your accuracy will increase a little as you break in the gun, the inner barrel actually adjusts by itself or something I forget the exact name.
Micro honing.

#7 check_six

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Posted 04 February 2013 - 02:58 PM

View Postkwaispro727, on 03 February 2013 - 06:17 PM, said:

G&G green bucking.  Though my SR10 is handled a 210% spring just fine with the stock bucking, I put the green in.  I will test more extensively next weekend.  Side note:  Your accuracy will increase a little as you break in the gun, the inner barrel actually adjusts by itself or something I forget the exact name.

I have decided to go with the G&G green since all I have read are great reviews on it

View Postvanevery, on 03 February 2013 - 06:37 PM, said:

If you can, use .30 bb's.
Better Accuracy and more Range.

I plan on getting some ksc/kwa .30 bbs as well, but are there any other bb brands that you all recommend?

#8 shogun

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Posted 04 February 2013 - 03:24 PM

Bioval .30g BB's shoot fantastic.  and they are bio should you play at fields where thats a requirement.

#9 Cpapp

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Posted 04 February 2013 - 03:36 PM

View Postshogun, on 04 February 2013 - 03:24 PM, said:

Bioval .30g BB's shoot fantastic.  and they are bio should you play at fields where thats a requirement.
I second that. I just got a bag from asgi, and they are superb. Got my km16 today too:) my friends use bioval .25's and they offer great accuracy. It's dark out, so I can't test them out yet

#10 check_six

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Posted 05 February 2013 - 02:56 PM

View Postshogun, on 04 February 2013 - 03:24 PM, said:

Bioval .30g BB's shoot fantastic.  and they are bio should you play at fields where thats a requirement.

View PostCpapp, on 04 February 2013 - 03:36 PM, said:

I second that. I just got a bag from asgi, and they are superb. Got my km16 today too:) my friends use bioval .25's and they offer great accuracy. It's dark out, so I can't test them out yet

I decided to read up on the biovals last night and now I have some on the way. All of the reviews I read sounded great and can't wait to try them out

#11 Cpapp

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Posted 05 February 2013 - 03:49 PM

View Postcheck_six, on 05 February 2013 - 02:56 PM, said:





I decided to read up on the biovals last night and now I have some on the way. All of the reviews I read sounded great and can't wait to try them out
Bioval has great QC my buddies have bought many bags with no defects. Have fun with the sr10!

#12 Mincey

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Posted 26 June 2013 - 08:10 PM

Can someone help me with this as well? I have the same problem! And i dont know how it can be fixed

#13 gcw360

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Posted 27 June 2013 - 06:09 PM

View PostMincey, on 26 June 2013 - 08:10 PM, said:

Can someone help me with this as well? I have the same problem! And i dont know how it can be fixed
Hi Mincey it would be helpful if, rather than having the members re-read the thread, you post what your is, or is not, doing.  Thanks.

#14 vanevery

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Posted 28 June 2013 - 02:42 PM

View PostMincey, on 26 June 2013 - 08:10 PM, said:

Can someone help me with this as well? I have the same problem! And i dont know how it can be fixed
Main thing is, thoroughly clean the inner barrel, bucking, and Hop-up unit.
You will need to be able to dis-assemble your Hop-up unit and properly re-assemble everything.
Here is a tutorial to learn how: http://kwausa.com/fo...p?showtopic=493
It looks way more complicated than it is.
Walk through it a few times and take it one step at a time.
You do Not need to remove the forward spring, Chamber Arm Bolt, or Chamber Arm.
Just let the Chamber Ark swing down from the Bolt.
  Once everything is re-assembled, apply pressure on the Chamber Arm to test to make sure the Arm is raising and lowering properly and that the Nub is doing the same and that it is centered in the barrel window. Should everything be installed correctly, your gun should shoot just fine. If it does not, it is the result of a worn out bucking and it needs to be replaced.

Edited by vanevery, 28 June 2013 - 02:42 PM.


#15 Jesse Hammil

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Posted 29 December 2013 - 07:42 PM

I have a similar issue. I got almost no hop on .28 BBS. I put a wire in my nub recently and it seemed to help.  What was the solution to the op? The gutYs at my local shop said my gun won't shoot anything over .25s well due to fps.

Edited by Jesse Hammil, 29 December 2013 - 07:43 PM.


#16 gcw360

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Posted 30 December 2013 - 06:48 AM

View PostJesse Hammil, on 29 December 2013 - 07:42 PM, said:

I have a similar issue. I got almost no hop on .28 BBS. I put a wire in my nub recently and it seemed to help.  What was the solution to the op? The gutYs at my local shop said my gun won't shoot anything over .25s well due to fps.
Jesse, if your RIS is firing 400 FPS with .2's then it should be handling .3's just fine out to 200 ft.  If you are not getting enough hop with the wire mod please post back.

Edit - I just saw the thread where you are going to do the flat hop....keep us posted on the results!

#17 Jesse Hammil

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Posted 30 December 2013 - 05:59 PM

View Postgcw360, on 30 December 2013 - 06:48 AM, said:

Jesse, if your RIS is firing 400 FPS with .2's then it should be handling .3's just fine out to 200 ft.  If you are not getting enough hop with the wire mod please post back.

Edit - I just saw the thread where you are going to do the flat hop....keep us posted on the results!

WIll do.  I've been obsessed with this and reading (and posting) all over. I'd better just simmer :)  I was in the bay area for work today and I thought I'd check out some airsoft shops.  All were cleaned out due to christmas and I couldnt pick up some buckings. I will have to order them.





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