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FAS - TECHNICAL REFERENCE For Upgrading & Modifications


Upgrades & Modifications

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Old July 12th, 2008, 05:24   #31
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Originally Posted by Gunk View Post
Any AEG, but AK only?

And I'm confused... are you telling us what FPS rating an AEG will have with certain springs?

I'm not a gun tech, and I coulda figured that out... I smell a bridge lurker.
I smell troll in the air. were is the troll hammer when we need him?
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Old June 4th, 2010, 11:01   #32
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thanks for the info
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Old June 4th, 2010, 11:06   #33
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God bless Pinoy airsofters....Thanks for the info!!!!
Originally Posted by BennyBoy View Post
If you were trying to insert a magazine into another magazine then I guess that would be indeed ghey. Inserting a magazine in a magwell seems rather hetero to me. The tape is merely metro, calling it ghey is rather absurd and makes it hard for the metro magazines to socialize with other magazines.
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Old July 23rd, 2010, 02:02   #34
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Question upgrading a G&G M4 CQB-R advanced

I need some suggestions on how to upgrade my G&G M4 CQB-R advanced. It fires around 370 FPS, I would like to get it around 450, but no higher than that.

Here are the features the advanced version already has:

8mm Ball Bearing Bushings

G&G "Strong" Motor

Metal Ball Bearing Spring Guide

Reinforced Piston

Metal Piston Head

Silver Wiring

Silver Electroplated Tight Bore Barrel

Could really use the help. Kind of new to airsoft. Thanks. is offline   Reply With Quote
Old July 23rd, 2010, 03:02   #35
Join Date: Jan 2009
Location: Fort st John, BC
hey guys, could someone give me the link to the shimming guide again, this one is no longer any good.
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Old September 11th, 2010, 05:13   #36
Join Date: Sep 2010
Originally Posted by Kokanee View Post
can anyone confirm the inner barrel length on the AK Beta Spetz being 300mm
or if that's a misprint?
I've seen sales sites saying it's 229mm like the mp5s
I forgot to check last time I had mine open but I think it's the same as the mp5s

and free bump for any new guys or gals doing research
cheap ibooks
ipad downloads
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Old September 13th, 2010, 11:02   #37
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Hey doramider7,

the 1mm from 300mm-229mm will not make much difference when you have put that into either your mp5 or AK beta. either length will be fine and shouldnt see the innerbarrel poking out the flash hider


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Old March 13th, 2011, 22:06   #38
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Thanks for all the info...Very Cool!
Please dont razz about insane ROF's. I am just messin around.
I am putting in KA 13.1 High speed gears with a KA sector clip. If my calculations are correct, it should buzz about 1900 rpm/31 rps.
I cannot find any specs on Hornbill HS motors. So I am estimating 25000. 9.6v/1500 nimh batt.
Does this sound correct?
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Old July 17th, 2015, 08:10   #39
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Originally Posted by Nocturnal View Post
*MODERATOR EDIT* This post has been edited to exclude information that is not applicable to those of us in Canada. I have however, left all links intact for the truly curious.

Posted here are collections of technical information from previous forum threads (FAS/AGL) and general facts from experienced veteran gunsmiths and players.

- - Technical Reference Info - - (by skipperooo)

SPRINGS: (Approx. Settled Spring FPS on .20gBB)
Stock Gun (brand new gun) = 270-290 FPS

CQB Gun: M100 / SP100 / PDI120% = 330-350 FPS - Typical indoor field maximum permitted.

Standard Field Gun: M120 / SP120 / PDI170% = 390-420 FPS [.20gBB stable] - Typical outdoor field maximum permitted. Anything stronger usually requires organizers permission.

Spring Power Chart
BB goes wild = BB too light -- BB range seems near = BB too heavy

*NOTE* These indications are FAS FPS Regulations and are NOT ASC FPS Regulations.

- - - - -

GEARS: (Does NOT affect Gun FPS, only ROF)
Infinite=(1) Ultra=(2) SuperTorqueUp=(3) TorqueUp=(4) StockRatio=(5) FastGear=(6)

>> Numbers indicate "car-gear-shift". *Small batts (non Sub-C) DOWNSHIFT to next LOWER gear. <<

Common Gear-to-Spring Setup for Big Batt (engine) (Sub-C):

Fast Gears (6) - UP TO M100 / SP100 / PDI120%

Stock Gears (5) can 'safely' handle up to M130, SP130, PDI190% <<<< on 9.6v 1700mAh(min)

Torque Up Gears (4) - M130 / SP130 / PDI190%-210% or LOWER

Torque Up Gears OR Super Torque Up (4/3) - M140 / SP140 / PDI240%

Ultra Torque Up Gears (2) - M150 / SP150 / PDI270%

Ultra or Infinite Gears (2/1) - M160 / SP160 << Needs minor machining to fit on Ver.2 GearBox

Infinite Torque Up Gears (1) - M170 / SP170 << Needs minor machining to fit on Ver.2 GearBox

*Some Gear set won't fit on some reinforced Gearbox- PLEASE CHECK first before you get one.

*No known machining on stock ver.3 GearBox to fit any gear set.
*AVOID using Bearing Bushings on M120 above. only for soft springs

M130 / SP130 / PDI190%-PDI210% on STOCK Gears will last Approx. 5-10 months (depends on use)
Stock Gears - Low Cost, nice ROF. will not last long. (cast alloy)
Flat Gears - Noisier, Cheaper. More durable (steel)
Helical Gears - Silent. Expensive. shimming sensitive (steel) <<Avoid pairing w/ Bearing Bushings

- - - - -

BATTERY: (Does NOT affect Gun FPS, only ROF and Rounds of fire)
Voltage = Rate of Fire (ROF) mAh = BB-Rounds (Power/Stamina)

BIG INTERNAL Standard Battery Size [Ni-CAD]:
M4A1 - 9.6v 1700mAh (Fat-long AA) V-Type 12v 1700mAh(max)

M4A1 Patriot - 12v 1700mah (Fat-long AA) Circular config

G36C - 9.6v 1500mAh (Fat AA)

M733 - 9.6v 1500mAh (Fat AA) Chako-Type 12v 1700mAh(max)

AK 47/Spetz - 10.4 2400mAh (Sub-C) 12v(max)

M16A1/A2/VN/SR16 - 9.6v 2400mAh (Sub-C) 13.2v(max)

CAR15 - 8.4v 600mAh (Small) 1500mAh (max) (Fat AA) 2-separates

P90 - 9.6v 1700mAh (Fat-long AA) J-Type

G3A3,G3SG1,MP5A4,MP5SD5 - 9.6v 2400mAh (Sub-C) Straight

MP5SD6 - 9.6v 1500mAh (Fat AA) V-type

MP5A5 - 9.6v 1100mAh (Slim) Chako-Type << (?)

Steyr AUG - 9.6v 1700mAh (Fat-long AA) Box-Type

PSG-1 10.8v 1500mAh (Fat AA) 13.2v(max)

M16 Dummy/Ready MAG - 9pcs 10.8v 1700mAh (Fat-long AA)

AN/PEQ 2 Dummy Laser Box - 9.6v 1700mAh (w/laser) 12v 1700mAh(max)

Approx. Battery-to-Rounds Capacity: [NiCd] (on M120 Stock Gears, EG1000)

9.6v 600mAh = <500 rounds (Small) Sanyo KR600AE 9.5mOhm Internal Resistance

9.6v 1100mAh = 1,000 rounds (Slim) Sanyo KR1100AAU 19mOhm Internal Resistance

9.6v 1500mAh = 1,400 rounds (Fat AA) Sanyo KR1500AUL 16mOhm Internal Resistance

9.6v 1700mAh = 1,800 rounds (Fat-long AA) Sanyo KR1700AU 17mOhm Int. Resistance

9.6v 1900mAh = 2,400 rounds (Sub-C) Sanyo N-1900SCR 4mOhm Internal Resistance

9.6v 2000mAh = 2,600 rounds (Sub-C) Sanyo KR-CH 6.5mOhm Internal Resistance

9.6v 2400mAh = 3,100 rounds (Sub-C) Sanyo CP-2400SCR 4.5mOhm Internal Resistance

9.6v 3000mAh = 3,800 rounds (Sub-C) Sanyo HR-SCU [Ni-MH] 5.3mOhm Internal Resistance

*can someone confirm this rounds guesstimation--
BEST BUY: 9.6v 1700mAh(small-type) 9.6v 2400mAh(large-type)

Approx. CHARGING Time on 1000mAh Output Charger:
600mAh = 36mins(min) 42mins(std) 48mins(max)
1100mAh = 1hr 6mins(min) 1hr 19mins(std) 1hr 30mins(max)
1500mAh = 1hr 20mins(min) 1hr 48mins(std) 2hrs 7mins(max)
1700mAh = 1hr 42mins(min) 2hrs(standard) 2hrs 24mins(max)
1900mAh = 1hr 53mins(min) 2hrs 18mins(std) 2hrs 43mins(max)
2000mAh = 2hours(minimum) 2hrs 24mins(std) 2hrs 48mins(max)
2400mAh = 2hrs 23mins(min) 2hrs 54mins(std) 3hrs24mins(max)
3000mAh = 3hours(min) 3hrs 37mins(std) 4hrs 13mins(max)
*Charger should be 1 to 3 volts higher voltage than total battery voltage
Go over to for more battery-charging-time calculations
DISCHARGING: Number of batteries in a Pack = Max discharge volts.
(ex. 9.6v = 8cells in a pack = 8.0v is the maximum discharged voltage)

- - - - -

PISTON: Depends on your spring and trigger abuse.
M140 Above = Aluminum Piston (for ratatat players)
. Choice1: ICS Aluminum Piston
. Choice2: Systema Aluminum Piston
*if compatible, get the half-tooth to lessen the weight
M140 Below = Polycarbonate Piston
. Choice1: Guarder Polycarb Piston (blue)
. Choice2: Tokyo Marui Stock Piston (white) <-- polycarbonate too
. Choice3: Systema Polycarb Piston (black) << brittle bad choice
AVOID the RED PISTON-Systema Polycarb (defective) there's a newer version
*haven't tried the TGS(blue), TOP or Prometheus Hard Pistons yet, but it looks promising <-- pls review
*some use polycarbs on m140 above but with trigger care

- - - - -

CYLINDER: (cylinderVolume-to-barrel-ratio) 2 is to 1 (standard)
Marui Stock Cylinders:

1. Closed Cylinder = 27.1cc 450mm(min) 580mm(max) barrel length

2. XM Cylinder = "4/5 hole" = 364mm(min) 460mm(max) barrel length

3. M4 Cylinder = "3/4 hole" aka Type-2 17cc - 229mm(min) 430mm(max) barrel length

4. MP5K Cylinder = "mid hole" 9cc 110mm(min) 170mm(max) barrel length

Systema NB Standard and BoreUp Parts:

1. Type-0 Cylinder (closed) fits M16-A1,VN,A2,G3-A4,SG1,SIG550,AUG

2. Type-1 Cylinder (tip hole) for XM177, M4, AK47, AK47S, SIG551

3. Type-2 Cylinder (XM hole) for MP5-A4,A5,SD5,SD6, MC51,SIG552

4. Type-3 Cylinder (M4 "3/4" hole) for MP5 PDW

5. Type-4 Cylinder (MP5K mid hole) for MP5K
*BoreUp Closed 29.4cc = 500mm(min) 600mm(max) barrel length

- - - - -

KM Cylinder Parts:

*Intercept Cylinder 59 barrel length from 450mm to 590mm (Type 0)
*Intercept Cylinder 45 barrel length from 250mm to 450mm (Type 2)
*Intercept Cylinder 25 barrel length from 100mm to 250mm (Mid-hole)

*To avoid confusion, don't mix brand model names, just model equivalence
*TM M733 by stock is closed cylinder (Type 0) -over ratio

- - - - -

RATIO Guide:
Standard-Efficient Ratio is 1.5 is to 1
2-2.5 : 1 for springs up to M130 --- 2.5-3.0 : 1 for strong springs M140 -> UP
<needs further research>

- - - - -

BARREL: (inner barrel length)

650mm/25.59in PSG-1 (extended)

595mm/23.42in APS2 OR

589mm/23.18in PSG-1

550mm/21.65in M16A1/VN/A2,AUG (extended)

534mm/21.02in Sig550

509mm/20.03in M16A1/VN/A2,AUG

472mm/18.58in Famas SV/F1

469mm/18.46in G3-A3/A4,SG1

455mm/17.91in AK47,AK47s

444mm/17.48in M60

407mm/16.02in M4A1 M653E2 (extended)

395mm/15.55in APS2 SV

369mm/14.52in HK51

363mm/14.29in M4A1,RIS,SR-16,XM177ED,Sig551

300mm/11.81in M1A1,AKBetaSpetz, M733

285mm/11.22in MC51

247mm/9.72in Car15,P90,G36C, SIG552

245mm/9.64in UZI - 400mm/15.74in (extended)

229mm/9.01in MP5A5/A4/SD5/SD6

170mm/6.69in MP5K-PDW (extended)

141mm/5.55in MP5K-PDW

110mm/4.33in MP5K

- - - - -


TM EG560 (famas)

TM EG700 (need more spec info)

TM EG1000 27,552rpm 1, Torque

Systema "Genuine" 29,825rpm 1, Torque

Systema "Hi-Speed" 37,400rpm 1, Torque

Systema "Hi-Torque" 32,302rpm 1, Torque

Systema "Super Hi-Torque" 34,787rpm 1, Torque

Eagle Force Hummer 1100 (high-speed)

Eagle Force Hummer 1300 (super-high-speed)

- - - - -

GAS: (for gas guns/pistols)

Duster = The little cans you buy at Future Shop

Green Gas = Propane

RED Gas = a bit higher pressure (?) than TOP Gas

BLACK Gas = highest pressure for airsoft <carbon<myth?

*pressures on 30C / 86F manila temp. / gas expansion speed differs from each type of gas

- - - - -

TM Gearbox Versions:

Version 1: FA-MAS F1, FA-MAS SV

Version 2: -M4A1, M4A1 RIS, M16A2, SR16, M16A1 VN, M16A1, XM177E2, CAR15, MP5A4, MP5A5, MP5 SD6, MP5 SD5, MC51, G3A3, G3A4, G3SG1, HK51

Version 3: AK47, AK47s, AK 47 Spetz, AUG Civ, AUG Mil, MP5K A4, MP5K PDW, SG550, SG551, SG552, G36C

Version 4: PSG1

Version 5: UZI

Version 6: P90, P90 TR, Thompson

- - - - -

*Disclaimer: This information has been taken straight from the FAS Forums and posted HERE for technical reference to help understand upgrades and modifications done to Airsoft Guns. Some Information may be modified for better understanding or for updating purposes. Please advise that upgrades and modifications are done at your own risk and it is recommended that you consult local professional gun smiths if possible.

- - - - -

- - - - -

Thank You and Enjoy Reading.

Just wanna ask what is better.. ICS turbo 3000 or Lonex A1 Titan..??
Thank you..
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Old July 17th, 2015, 13:05   #40
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which motor is good for m140..?? ICS turbo 3000 or Lonex A1 Titan...???
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Old October 11th, 2021, 15:13   #41
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Never seen it this way, plenty of lessons to draw here!
Thanks pal
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