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SR7 Spring Replacement Help *Done, Thanks for the Help!*

kwa sr7 spring replacement upgrade tutorial disassembly video youtube help

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#1 frankster127

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Posted 05 January 2013 - 06:11 PM

I'm new to airsoft in general and I want to replace my stock spring from my sr7 to a m140. Is there a video that's out there that shows how to replace the spring from disassembling to assembling the gun back together (only the spring and nothing else). I haven't been lucky to find a video on youtube, or the video completely shows how to break the gun down to the bones and I don't want to do that because I don't have much experience. Also, just to throw it out there I went to my local airsoft shop and they chrono my sr7 (one week old) and it's only shooting around 305 fps! Not even close to the 330-350 that they are advertising, they also shot the sr7 they have displayed and it's the same result. That's the reason I'm upgading my spring to use it on the next game they are having. Thanks!

.20 BB's (but will use .25 when playing)
Hop-up OFF
Trying to obtain 450 fps w/.25 BB's.
Field

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Edited by frankster127, 06 January 2013 - 07:48 PM.


#2 gcw360

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Posted 05 January 2013 - 06:23 PM

I have a couple of questions but I'm sure we can help you.  What BB's are you using, was the hop-up on when chronoing and what FPS are you looking to obtain?  Also, are you shooting CQB or field.  An M140 will have you around 480+ FPS with .2's.  With a longer barrel it would have you at 500 FPS!

#3 frankster127

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Posted 05 January 2013 - 06:33 PM

We we're using .20 BB's. Hop-up was off when it was chronoed. I'm hoping to get close to 450 fps because the owner of the shop picked a m140 spring when I asked him. We're playing in a field.

#4 gcw360

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Posted 05 January 2013 - 06:58 PM

View Postfrankster127, on 05 January 2013 - 06:33 PM, said:

We we're using .20 BB's. Hop-up was off when it was chronoed. I'm hoping to get close to 450 fps because the owner of the shop picked a m140 spring when I asked him. We're playing in a field.
Give it a try.  I've never put an m140 in an Sr7 so I'm guessing with my numbers.

#5 frankster127

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Posted 05 January 2013 - 07:10 PM

View Postgcw360, on 05 January 2013 - 06:58 PM, said:

Give it a try.  I've never put an m140 in an Sr7 so I'm guessing with my numbers.
That's why I need help how to put it on.

#6 gcw360

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Posted 05 January 2013 - 07:51 PM

View Postfrankster127, on 05 January 2013 - 07:10 PM, said:

That's why I need help how to put it on.
I understand....but a video of a Tokyo Marui spring swap will not be an exact step-by-step guide.  I'm sure others will chime in with help when they have the chance.  If I find something, I will post it but as of now there are no KWA videos regarding a spring swap.

#7 Chuck S

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Posted 06 January 2013 - 07:30 AM

In my experience you may want to run the gun thru the warranty period before boosting the muzzle velocity.  My LM4 chronographed slow until a new bucking was installed.  Different gun but same principle.  You might want to pull the barrel and clean/wash it and the rubber bucking and see where she is.

Nevertheless keep us informed as to how yours chronographs as I'd eventually like to get more velocity out of my KM4-CQB which is currently running about 340fps (down from 365 after several thousand BBs).

-- Chuck

#8 KiloBravo

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Posted 06 January 2013 - 01:14 PM

Definitely sin it through it's paces before replacing the spring...

Look on the bright side.....at least you have your SR7 to tinker with....I am still waiting....since October...

#9 kwaispro727

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Posted 06 January 2013 - 01:28 PM

Ah, I have the perfect video for you.  When in doubt, visit 808kameleons channel, chances are he has something.  It is the exact same process for the SR7, KM4 RIS, and SR10.  Here you go :)

Part One:


Part Two:


Those will show you how to get to the gearbox.  All you need to do once you are in is take out the spring, take it off of the spring guide, replace it with your new M140, and then put the spring/spring guide back in.  Watch the whole part about being inside the gearbox, you will get a better understanding of how it works and learn about your gun in general.  I used these videos when I first took apart my gun.  The only way to learn is to just go for it.  Message me if you need help just getting it back together, I'm sure I can help.  I was right where you are last summer.

One little thing.  Unless you really want to, do NOT take the wiring completely out of the buffer tube.  Some people find it easier, I certainly don't.  If you choose to, all I can say is get a small pair of pliers or tweezers, a flashlight, and GOOD LUCK to you sir!.  Getting the little washer positioned with the wiring is a job straight from hell lol.

Edited by kwaispro727, 06 January 2013 - 01:42 PM.


#10 frankster127

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Posted 06 January 2013 - 04:22 PM

View Postkwaispro727, on 06 January 2013 - 01:28 PM, said:

Ah, I have the perfect video for you.  When in doubt, visit 808kameleons channel, chances are he has something.  It is the exact same process for the SR7, KM4 RIS, and SR10.  Here you go :)

Part One:


Part Two:


Those will show you how to get to the gearbox.  All you need to do once you are in is take out the spring, take it off of the spring guide, replace it with your new M140, and then put the spring/spring guide back in.  Watch the whole part about being inside the gearbox, you will get a better understanding of how it works and learn about your gun in general.  I used these videos when I first took apart my gun.  The only way to learn is to just go for it.  Message me if you need help just getting it back together, I'm sure I can help.  I was right where you are last summer.

One little thing.  Unless you really want to, do NOT take the wiring completely out of the buffer tube.  Some people find it easier, I certainly don't.  If you choose to, all I can say is get a small pair of pliers or tweezers, a flashlight, and GOOD LUCK to you sir!.  Getting the little washer positioned with the wiring is a job straight from hell lol.

Thanks for the great info! This will certainly help me a lot!

#11 frankster127

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Posted 06 January 2013 - 04:24 PM

View PostChuck S, on 06 January 2013 - 07:30 AM, said:

In my experience you may want to run the gun thru the warranty period before boosting the muzzle velocity.  My LM4 chronographed slow until a new bucking was installed.  Different gun but same principle.  You might want to pull the barrel and clean/wash it and the rubber bucking and see where she is.

Nevertheless keep us informed as to how yours chronographs as I'd eventually like to get more velocity out of my KM4-CQB which is currently running about 340fps (down from 365 after several thousand BBs).

-- Chuck

I already cleaned the barrel and bucking (thanks to the video somewhere in this forum).

I'm gonna remember to update you with my fps as soon as I replace me spring. =)

#12 kwaispro727

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Posted 06 January 2013 - 07:38 PM

I just thought of the first time I changed my spring... Don't underestimate the strength of the spring you are putting in.  I slipped with the KWA M130 ( about equal to an M120) and my spring guide went flying across the room.  I would keep the back of that gearbox pointed away from anything of value the first time lol

Edited by kwaispro727, 06 January 2013 - 07:45 PM.


#13 frankster127

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Posted 06 January 2013 - 07:47 PM

View Postkwaispro727, on 06 January 2013 - 07:38 PM, said:

I just thought of the first time I changed my spring... Don't underestimate the strength of the spring you are putting in.  I slipped with the KWA M130 ( about equal to an M120) and my spring guide went flying across the room.  I would keep the back of that gearbox pointed away from anything of value the first time lol

I just finished putting back the gun together and it took 2 of us to hold gearbox together while I was trying to put the spring on! LOL It was a b to put that hard spring.





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