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KWA SR10 DMR Build

Sr10 sniper dmr

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#1 airforceloner1

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Posted 23 December 2013 - 12:25 PM

So Im looking foward to upgrading my SR10 into a dmr but I dont wanna run a lipo and I wanna stay under 500fps.
So my parts breakdown is consisting of
Matrix Helica 300:100 gears
Echo 1 Mosfet
Modify Baton Ryusoku flat nub bucking
G&G Ported Aluminum Reinforced Piston Head (only because i have had great experience with them in all weather)
Lonex Uluminum Double O Ring cylinder Head
Matrix CNC Aluminum Air Seal Nozzle (I have one in my m4)
Systema M130 Spring
Deans Connectors
Systema m130 spring
Intellect 9.6v 1600mAh battery

My plan with the mosfet is to take the sensor wire off the trigger and disconnect from the rest of the wiring assembly then modify the stock kwa wiring and trigger assembly to accompany the mosfet setup.

Also im wondering if i use the m130 will i really need high torque gears or can i get away with the stock motor, gears and run a mosfet and still get decent trigger response and rate of fire?

The last thing is the systema m130 springs are rated at 450fps max but im wondering if i completly seal the compression parts like the nozzel, piston head, cylinder and cylinder head, is it possible for me to achieve over 450? like for ex 475?

Somone give me some feedback, I'm trying to keep my budget under $150

#2 vanevery

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Posted 23 December 2013 - 03:50 PM

DMR's do not have to be expensive, but there some things a DMR needs to qualify as a DMR. You budget of $150.00 is perfectly fine and can be done for much less. Based on what you stated in your OP, my assessment is that you do not have much experience in DMR builds. This is not judging your skills, just an assessment from experience.

Here are suggestions regarding your parts list and approaches to take. I believe it is most important to work within your skill level and take steps regarding implementing new mods and ideas into your gun  builds. I advise getting the most out if your gun and its stock parts and only replace what is necessary for the specific type of gun build you are working on. My suggestions will be based on beginner kill level and for a low budget.
I can say this regarding your parts list.
Avoid anything with the word MATRIX on it.

Base DMR / Beginner Skill Level / Low Budget
- Semi-Only Selector Plate Mod.
Super Easy to do and hard to mess up.
If your gun can shoot Full-Auto it is not a DMR.

- Full / Type-0 Cylinder.
Max air volume is a defining characteristic of a DMR.

- Piston Head:
Normally I recommend a Ported Piston Head.
There is nothing wrong with using your stock Piston Head and by doing so will give you a good performance comparison should you decide to change it out later on.

- Cylinder Head:
Stay with stock KWA Cylinder Head

- Air Nozzle
Stay with the stock KWA Air Nozzle.

- Gears:
You do not need Super/Monster/Infinite/ whatever extreme high torque gears.
Your stock KWA gears will pull an m150 with ease.
I am about to install an m170 using my stock KWA gears in one of my DMR's

- Shimming:
Super Important.
Without it, you risk destroying your gears and Ball Bearing Bushings.
Learn the principles of shimming.
Learn of Bevel Pinion Method.

- Inner Barrel:
Your stock KWA 425mm is a high quality barrel and a good length.
Stay with it and see what it can do.

- Less than 500 FPS
The Systema m130 spring will keep you under 500fps for sure.
Good choice of Main Spring.

- Quality heavy ammo of at least .32's (.40 preferably).

- Mid Cap Mags

- Bi-pod.

- Scope.

Hop-up Unit:
You can be fine with a quality drop-in Bucking.
G&G Green
Lonex 70 Degree
Prommy Purple
Should you be up for the challenge, look into Flat-hop and R-hop.

Electrical:
You don't have to have a Li-po battery or Mosfet.
If you stay with NiMH batteries, use no less than 9.6v of at least 3000mah.
Semi-Auto drains a battery fast.
Switch to Deans if you can, but you do not have to for NiMH batteries.

Keep it simple for your first DMR.
As your skills grow, go for the more advanced mods and higher quality parts.

Edited by vanevery, 24 December 2013 - 03:23 PM.


#3 Jesse Hammil

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Posted 24 December 2013 - 11:20 AM

This is intriguig. Please keep us updated!



#4 niko_gpsy

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Posted 24 December 2013 - 02:11 PM

I recommend that you keep the stock KWA gears for your FPS target.  I am currently running a DMR shooting around 575FPS (SP150/ M160 spring) using stock KWA gear set.  They can really take a beating so I would think it's a waste of money to buy a whole new gear set.  You just have to reshim the gears well and you are good to go.

#5 Jesse Hammil

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Posted 26 December 2013 - 03:49 PM

Hello,

I have been doing some reading since posting this. In an effort to not clutter the board, I thought I'd post to this thread.

So I am thinking about turning my RIS into a DMR.

I'm trying to make a list of what parts I need and what is important to building a DMR. So here are my questions:

1) Do I need to get a lipo?  I use 9.6v 1600mAh NiMh batteries now.  I am going to my local shop soon and they have 11.1v only in 20c 1200mAh.  Also what is the advantage of lipos vs nimh?

2) Will I need to increase FPS beyond 400?  

3) Do I need a new motor to pull a spring past an m130?

4) Are mosfets required in a DMR build?

Anything I'm missing?

I am also ordering a km head 6.02mm barrel next week if that makes any difference.

#6 airforceloner1

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Posted 26 December 2013 - 06:11 PM

Thankyou Vanevery, I was just looking at this guys kwa sr10 dmr and he seems to be fairly adiquate with alot of teching considering he does all the reviews for inside the mechbox at airsplat.com



I do want to run a flat hop by modify refured to as the Ryusoku bucking. I used to own one but was not impressed with the results due to an improper instalation although I installed it into a M14 Dmr I built for a close friend and it works beautifly. Back to the Sr10

my overall questions was to do with the gears and can they take a m130-m140 spring on a 9.6v 1800mah battery, wich was answered very well based on personall experience. Now for the Mosfet. I want to keep good trigger response so will an standard cheater Echo 1 non programable mosfet help? Also With the group i play with we play by minimum engagement distances and not the semi rule over a certain fps I do not wish to do the selector plate mod you speak of.

Towards compression parts i do not prefure the kwa nozzel due to the fact it doesnt have the O-ring on the inside and a large amount of pressure can be lossed. also I had taken a previous techs advice on keeping the stock cylinder head, shortly within 7000 or so rounds i blew the nozzel out of both of them. So I now use aluminum with sorbo on the front and back with a double O ring to keep things well padded and to keep maximum compression.

I have bad experience with the stock piston head also hence im going to go with an aluminim g&g ported piston head because its the closes thing in size that i have matched to a kwa stock piston head.

I just stripped my first piston yesterday  after 2 and a half years of owning my m4 so im not worried about that.

I understand shimming is very important and i forgot to post that in the opening statement so my appologies.

I run deans in all my guns just to keep from melting timia connectors. so fully understandable.

Edited by airforceloner1, 26 December 2013 - 06:15 PM.


#7 Roy Chan

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Posted 27 December 2013 - 10:02 PM

Well i don`t really know about the internals for the gearbox because i don`t have a dmr
but for the barrel and hop up here are some really good ones that will make it go 180-275feet depending on fps and setup
buckings
maple leaf (better than Prometheus` purple bucking and is claimed more durable , also cheaper price (10$)
rhop mod (custom hopup bucking mod , gives way better backspin) around 18$
h hop mod (same bucking mod just for different barrel windows)around 18$
now for barrels
the miracle barrel (really tight dont rember the size its like 6.01 or 6.00 , amazing , increases range a ton and the fps by 10 or 15, the accuracy will be amazing and also there is a small track inside so the bbs are consistently accurate.
Prometheus barrel (just a tight bore noting much but amazing quality and accurate)
any standard/stock vfc barrel , they are very accurate too but for a stock barrel , not as good as the other ones a bit , of course.
sorry bout the bad grammar and everything but hope this helps

#8 airforceloner1

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Posted 29 December 2013 - 09:12 PM

Alright boys so heres the deal ive decided to get a G&G GR25 Top Tech Rifle cause of the gearbox version. Dont Stop Reading!

My plan is to run a KWA 2GX gearbox with the elongated Cylinder head and air nozzle.

Other then that im lost.
So my questions are...
Bucking? Barrel? Wiring? Battery? Any other parts i should use? this time my budget has dropped to $80 due to the inflasion of the origional gun price...

#9 gcw360

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Posted 30 December 2013 - 06:46 AM

View Postairforceloner1, on 29 December 2013 - 09:12 PM, said:

Alright boys so heres the deal ive decided to get a G&G GR25 Top Tech Rifle cause of the gearbox version. Dont Stop Reading!

My plan is to run a KWA 2GX gearbox with the elongated Cylinder head and air nozzle.

Other then that im lost.
So my questions are...
Bucking? Barrel? Wiring? Battery? Any other parts i should use? this time my budget has dropped to $80 due to the inflasion of the origional gun price...
Pretty sure the 2GX won't fit in that G&G receiver.

#10 airforceloner1

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Posted 30 December 2013 - 12:32 PM

View Postgcw360, on 30 December 2013 - 06:46 AM, said:

Pretty sure the 2GX won't fit in that G&G receiver.

Uhm whynot? Its a v2..

#11 gcw360

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Posted 30 December 2013 - 04:52 PM

View Postairforceloner1, on 30 December 2013 - 12:32 PM, said:

Uhm whynot? Its a v2..
Because KWA gearboxes are a whole lot beefier than other V2 gearboxes.  The only lower I have ever seen a KWA gearbox fit in other than a KWA lower without significant mods is a TM.  It will not fit in a G&G receiver.

#12 airforceloner1

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Posted 31 December 2013 - 09:25 AM

View Postgcw360, on 30 December 2013 - 04:52 PM, said:

Because KWA gearboxes are a whole lot beefier than other V2 gearboxes.  The only lower I have ever seen a KWA gearbox fit in other than a KWA lower without significant mods is a TM.  It will not fit in a G&G receiver.

Correct me if im wrong but arent all v2 gearboxes pretty much designed after TM styles?
So if G&G is a TM replica why wouldnt it fit?..

#13 gcw360

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Posted 31 December 2013 - 02:42 PM

View Postairforceloner1, on 31 December 2013 - 09:25 AM, said:

Correct me if im wrong but arent all v2 gearboxes pretty much designed after TM styles?
So if G&G is a TM replica why wouldnt it fit?..
You are absolutely correct, most V2 gearboxes are designed after TM. And I suppose a G&G would fit in a TM receiver though I haven't personally tried.  The KWA 2GX gearbox will not fit in a G&G lower.  The 2GX has more material that makes up the gearbox shell that is added with the intention of making it stronger and less apt to crack from extended use or dry firing. I'm not trying to be a Debbie downer, no offense to Debbie, I'm simply stating fact and hoping to save you the expense and frustration that will occur when you can't get the 2GX to fit and properly work.

Now, you could take a dremmel to the gearbox, and probably the receiver, and you may get it in there.  But the material you remove defeats the purpose of it being there in the first place.  Don't take my word for it, look at the mods done on KWA's in the photo gallery.  You won't find a G&G body in there.  You may find a heavily modded G&P or a modded Madbull...I've seen one of each in the 4+ years I've been a KWA moderator.

Anyone else care to weigh in?

#14 vanevery

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Posted 31 December 2013 - 04:34 PM

A KWA gen1 Mechbox will fit the G&G Lowe Receiver, but a 2gx is a ? When you deal with any brand that is not TM or a TM clone, that does not automatically mean that everything is TM spec and will fit. Specifically regarding fitting a 2gx mechbox into any other brand of receivers, most of the time, it is not so much the mechbox will not fit into the Lower Receiver. It is usually the Upper Receiver will not close over the top of the mechbox shell due to the KWA reinforced front most part of the mechbox shells. So theoretically, the 2gx mechbox may actually fit the G&G Lower Receiver, but the Upper Receiver may not close over it, especially if it utilizes a one piece Hop-up Unit.





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