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Old 02-06-2020, 06:43 PM   #1
Young Gun
 
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A&K sr25. Parts Advise

I just recently purchased an A&K sr25 and looking to upgrade it. I've only ever ran BASRs so this is new territory to me but it's always a project I've been wanting to do so I finally pulled the trigger on it. The gun is bone stock. So far these are the parts I'm looking at, just want to know if the parts are compatible with each other before purchasing. Thanks in advance for the help.

Base:A&K sr25
Cylinder: Stock Cylinder just gonna polish it
Cylinder Head: ICS Oversized Aluminum Cylinder Head
Piston: SHS 19-tooth Full Metal Rack Piston for SR-25
Piston Head: ICS Aluminum Alloy Oversized Piston Head
Spring: m140 or m150(anything to get me close to 520-550)
Air Nozzle:SHS Aluminum Air Seal Nozzle for SR25 (with O-Ring)
Gears: SR25 Super high speed gear set
Shims: SHS
Hop Up Chamber: Deciding between Modify or Lonex
Barrel: Prometheus 6.03 EG Tight Bore Inner Barrel 407mm(R-hopped)
Bucking: Maple Leaf Macaron 70 degree
Nub: M nub
Wiring: not too sure
Battery: not too sure
Motor: not too sure


I think that's about everything that I have researched, let me know if I'm missing anything. Thanks for feedback.
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Old 02-06-2020, 07:17 PM   #2
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Maple leaf bucking w/ rhop???? It's one or the other, unless you plan on modifying the macaron. Don't think that would be the best option. Also, if you are considering macaron as the bucking, they work alright, but aren't anything amazing.
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Old 02-06-2020, 08:36 PM   #3
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Originally Posted by FMP Airsoft View Post
Maple leaf bucking w/ rhop???? It's one or the other, unless you plan on modifying the macaron. Don't think that would be the best option. Also, if you are considering macaron as the bucking, they work alright, but aren't anything amazing.
Thanks for the feedback. Yes I was planning to flat mod it with w/rhop. Any bucking that you recommend?
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Old 02-06-2020, 11:26 PM   #4
1tonne   1tonne is offline
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Cool. I love SR25's. Especially high end ones. I made one that produced 3.78 joules on 0.48gm reliably. So about 640fps on 0.2gm bb's. Though this rifle was tuned for a heavy weight bb and so if I tuned it for a 0.2gm, then it would most likely be about 700fps.


At 550fps, you will want to use a heavy bb. A lot of people use 0.4gm bb's as this level because they are good value for money but your rifle will be capable of flinging 0.48gm bb's and they will be more accurate.


First off the gearbox most likely will die pretty quick and so you will most likely need a new one soon. Retro Arms are in the process of refining the front of their gearbox at the moment and so I would wait a month or two before purchasing one.


Anyway this is what you will need:
-Stock Cylinder
-Plastic SHS Piston (Preferably a metal one but they need modding.)
-Aluminium Piston Head
-A&K Cylinder head (You could get a metal one)
-32:1 SR25 gears. To make these purchase the Super Shooter SR25 Gears. The sector gear has 3 Allen screws that hold it together. Also purchase the Super Shooter 32:1 gears (They also have 3 Allen screws). Pull apart the sector gears on both and put the 32:1 teeth onto the SR25 sector gear. Then you have SR25 32:1 sector gears.
-M170-180
-6.01mm barrel (between 410mm-470mm)
-SHS High Torque motor


The problem with the Aluminium Pistons is that they are about 2mm longer than plastic pistons. This means that the piston head does not get pulled back as far as the plastic pistons. Also, when you line up the teeth from a plastic piston with the Aluminium Piston, the teeth on the aluminium piston are about 2mm further back. So this means that the piston head sits another 2mm forward. So in total, the aluminium piston seats the piston head about 4mm further forward than the plastic piston. So that is 4mm worth of cylinder volume that is not getting used just by using an aluminium piston.


To make a metal piston the correct length, grinded down the rear of the metal piston until it is the same length as the plastic piston. Then get the teeth out of the plastic piston and put it in the metal piston. This will put the teeth in the correct position and the piston will be the correct length.
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Last edited by 1tonne; 02-07-2020 at 01:03 AM.
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Old 02-07-2020, 04:41 AM   #5
 
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Sounds a lot like my sr25. Hope you have deep pockets. Ain't cheap building a solid dmr. Piecing mine together ran over $1300. The biggest being all the components in the gearbox. RetroArms gb, piston, tappet, selector, trigger, custom piston head, lonex psg cylinder, lonex v2 head. Gate titan, 26:1 siegetek gears, aac 30k motor. Prometheus m135. Lambda 363 01 barrel, flat hopped lonex 70 bucking, maxx model hopup.
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Old 02-07-2020, 03:06 PM   #6
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Yip. Mine was a similar cost to yours but without the Gate mosfet (I have another cheaper mosfet) and Siegetek Gears.
By the way, the Super Shooter gears are a really good design. Even the last tooth on the sector gear is thicker than normal and it can handle really big springs without breaking teeth off.
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Old 02-07-2020, 04:02 PM   #7
 
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Well I opted for the Siegeteks because all the shs/zci/super shooter/rocket/whatever are all the one you cannot take apart, and I wanted a set of gears i would have a hard time killing. Matter of fact I have yet to find one that I can. I take that back, there was a set of high speed gears that I saw, but were out of stock.

Where do you get them from?

Your using the t238 (or whatever it is) from Aliexpress right?
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Old 02-07-2020, 04:14 PM   #8
 
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Oh I forgot something important. With all of these upgrade parts, there will be some fitting and calibrating involved. Not to mention your shimming needs to be on point. You do not immediately need a RetroArms gearbox, but just know its only a matter of time till the stock one blows out. (Or as many of the other parts.)

Of coarse this greatly depends on how hard you push it too and if you use an STS, and all your modifications are on point.

You have worked on an AEG before right?
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Old 02-07-2020, 04:15 PM   #9
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The SR25 gears I got from 18airsoft but the 32:1's were really hard to find. In the end, I actually found them locally for a really cheap discounted price.


The mosfet I use wasn't the T238. Though I have had them and they were useless. Maybe it was my wiring but I think it was more the mosfet. I would fire it once and then it would burn out.
The one I use a like a Burst Wizzrd3. It does not have the microswitch trigger but I don't need that as I make my on micro switch triggers. Mosfet only cost US$25.00 including freight (From Aliexpress)
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Old 02-10-2020, 02:42 AM   #10
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Quote:
Originally Posted by Plazmaburn View Post
Sounds a lot like my sr25. Hope you have deep pockets. Ain't cheap building a solid dmr. Piecing mine together ran over $1300. The biggest being all the components in the gearbox. RetroArms gb, piston, tappet, selector, trigger, custom piston head, lonex psg cylinder, lonex v2 head. Gate titan, 26:1 siegetek gears, aac 30k motor. Prometheus m135. Lambda 363 01 barrel, flat hopped lonex 70 bucking, maxx model hopup.
I was looking at the maxx model hopup but not sure which model to choose from: Me - Pro, Me - Sport, MI - Pro , MI - Sport. Which model did you choose? Also are you still using a 24mm air nozzle or do downsize to fit the maxx model? Thanks for all the help btw

Last edited by Skidattle; 02-10-2020 at 02:51 AM.
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Old 02-10-2020, 03:05 AM   #11
1tonne   1tonne is offline
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One question someone may be able to answer. Can the Maxx Hopup fit a Mag Well Shock Reducer?
If not, then stick with the stock one as you are best to use a shock reducer to help with the longevity of the rifle.
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Choosing the right spring and making it work
https://www.airsoftsniperforum.com/32...tml#post127126
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Old 02-10-2020, 05:14 AM   #12
 
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I dont know. Still waiting for my STS to show up. If not, its going to get modded to work. shouldn't require too much. But we will see.

I got the ME-Pro. Any marked with an MI is for ICS brand guns and are not compatible with regular AEGs.
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Old Yesterday, 06:43 PM   #13
SHEED   SHEED is offline
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I've got a Prowin in my SR and I can't fit a shock reducer in without substantial grinding.
For some reason, I couldn't fit a standard M4 hop chamber in mine. ( 1tonne and have the same gun minus that mine is a retro arm spilt box and he is using a traditional GB shell)

I'm imagining the maxx would about the same shape as the prowin?
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Old Yesterday, 06:57 PM   #14
 
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Pretty close, I think if memory serves I had to modify mine. Though dont quote me on that, as my SR is not "stock." Outer barrel is different on mine. I have been messing with far too many AEGs so I may have it confused.
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