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Old 12-03-2019, 05:17 PM   #1
RnB8819   RnB8819 is offline
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A&K SR25 Internals Replacement Parts

Good day, I own an A&K SR25 with v2.5 gb having this for its internals:
SHS SR25 reinforced gear set
SHS 19T Full steel teeth piston
Tienly 30000 motor
EDGI 6.01 650mm bull barrel (DIY R-hopped)
Guarder SP150
M-block
Stock hop up chamber
Stock cylinder
Stock cylinder head
Stock air nozzle

My question is, what can I use to replace my cylinder head & air nozzle. Because my problem is it's very hard to find SR25 parts here in my place. I thought I can use AUG air nozzle but the inner diameter was too small to fit the stock cylnder head. So I was thinking to use standard M4 cylinder head + AUG air nozzle. Will it work fine or do I have to modify anything? Will it affect my air volume or FPS if I use a standard M4 Cylinder head and air nozzle due to its smaller inner diameter?

Thank you guys...
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Old 12-03-2019, 09:00 PM   #2
 
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You will need to find a Guarder bore-up head and nozzle.
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Old 12-03-2019, 10:56 PM   #3
RnB8819   RnB8819 is offline
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Quote:
Originally Posted by Plazmaburn View Post
You will need to find a Guarder bore-up head and nozzle.
That might be impossible to find in my country... have anyone here tried the AUG cylinder head and air nozzle?
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Old 12-03-2019, 11:21 PM   #4
RnB8819   RnB8819 is offline
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These are the list of what I can opt to...
Standard M4/AK/AUG cylinder head & nozzle
MA bore up kit for M4/AK
Stock CA cylinder head & ASN
Guarder M4 bore up kit (too expensive here)

Is there anything on the list that I can mix up to fit my A&K SR25?
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Old 12-04-2019, 04:32 AM   #5
1tonne   1tonne is offline
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You need an SR25 length air nozzle (24mm long) to make the SR25 feed properly.
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Old 12-04-2019, 12:17 PM   #6
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aug nozzle will work, no problem, the cylinder head however for that AUG is offset and wont work. BUT any standard m4 V2 cylinder head will work just be sure you match the cylinder to the cylinder head and nozzle for either bore up or non bore up. But you absolutely need a SR25 or V2.5 cylinder as they are longer than the standard

and DON'T use a 650mm barrel, that's not going to work. well it will, but your wasting power. If anything shorter inner barrels (500 is standard and work work way down depending on the bb weight you run) are the way to go. You only need a bore up kit if your trying to hit that 600fps mark, and are worried about straining your gearbox since you can use a lighter spring with the bore up

Now as far as fit, you probably got an off spec AUG nozzle. Matching a standard M4 cylinder head with a standard AUG nozzle will work . If in doubt , use the same brand, just dont mix the bore up and standard combo. There is a chance that if the aug nozzle you have right now dosent fit, you may already have a bore up kit installed, maybe the guy before you did it if its used or something.

Last edited by ArcAngel; 12-04-2019 at 12:31 PM.
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Old 12-04-2019, 01:28 PM   #7
1tonne   1tonne is offline
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This is the barrel lengths I use for an SR25 (6.03)
BB weight-----Barrel Length-- Barrel Volume----- Ratio
0.2gm------------505mm---------14336mm3------2.17:1
0.23gm----------502mm---------14193mm3-------2.19:1
0.25gm----------495mm---------13993mm3-------2.22:1
0.28gm----------490mm---------13908mm3-------2.24:1
0.30gm----------484mm---------13708mm3-------2.27:1
0.32gm----------467mm---------13279mm3-------2.36:1
0.36gm----------442mm---------12565mm3-------2.48:1
0.40gm----------414mm---------11709mm3-------2.65:1
0.43gm----------402mm---------11423mm3-------2.73:1
0.45gm----------391mm---------11080mm3-------2.81:1
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Old 12-05-2019, 08:52 AM   #8
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Please 1tonne tell what kind of SR25 you are talking - a&k with 2.5 gearbox(cylinder) or the one with standard aeg gearbox?
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Old 12-05-2019, 01:29 PM   #9
1tonne   1tonne is offline
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I am talking about the A&K SR25 with the V2.5 gearbox and longer cylinder.
Though in a standard V2 gearbox, the barrel lengths I use are:


BB weight-----Barrel Length-- Barrel Volume----- Ratio
0.2gm------------435mm---------12423mm3------2.17:1
0.23gm----------430mm---------12280mm3-------2.19:1
0.25gm----------425mm---------12137mm3-------2.22:1
0.28gm----------420mm---------11994mm3-------2.24:1
0.30gm----------415mm---------11851mm3-------2.27:1
0.32gm----------400mm---------11423mm3-------2.36:1
0.36gm----------380mm---------10852mm3-------2.48:1
0.40gm----------355mm---------10138mm3-------2.65:1
0.43gm----------345mm----------9852mm3-------2.73:1
0.45gm----------335mm----------9567mm3-------2.81:1
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Old 12-08-2019, 04:18 PM   #10
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Might be a long shot for where you are. But guarder make a cylinder for the psg-1, exact same length as the V2.5 cylinder, only it has the standard diameter of a v2 cylinder. So it'll allow you to use normal M4 cylinder heads. Also if you can source shs parts easily, they already make an SR25 specific air nozzle.

These are the parts I use in my SR25, and they work incredibly well together.

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Old 12-08-2019, 11:51 PM   #11
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Quote:
Originally Posted by Darcy_mcdonald View Post
Might be a long shot for where you are. But guarder make a cylinder for the psg-1, exact same length as the V2.5 cylinder, only it has the standard diameter of a v2 cylinder. So it'll allow you to use normal M4 cylinder heads. Also if you can source shs parts easily, they already make an SR25 specific air nozzle.

These are the parts I use in my SR25, and they work incredibly well together.

Sent from my Pixel 3 XL using Tapatalk

don't have to be psg-1, find cylinder made for sr25/ svd/r85, it very common theseday.
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