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Old 06-06-2018, 04:31 AM   #1
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Medium budget build: S&T M40a3 review & diary!

Finally I can bought UFC/S&T M40a3 spring powered. it just Asia version ( export to Japan) so not PDI custom. After research around, digging everything I can on youtube. Basiclly I don't see any full reviews about this gun. So I hope this will help anybody want to build this gun.


First imperrsions:

+ The gun pretty well made, my gun is black color, it have 3 colors ( TAN, OD, BK ). From specs brand provide to package:



steel parts:
+ steel triggers internals ( trigger, 2 sears, spring guide stopper ). The trigger is 90 degree system, trigger pull is light with stock gun.

+ Steel bolt handle ( very nice ).
+ Steel cylinder ( only cylinder body )
+ Little steel point on stock spring guide )

Aluminium parts:
+ Outer barrel, pretty thick and nicely color.


Potmetal/whatever materials parts:
+ End cap of bolt ( )
+ Upper receiver & railmount
+ End shaft of the cylinder, and it have same design like WELL cylinder/cheap sniper gun .

+ Magazine house.
+ hop-up chamber ( PDI design ). very annoy.



Brass parts:
+ Cylinder head ( have mushroom design like on AEG)


Plastics parts:
+ Spring guide, piston ( 90* ).
+ Stock made by nylon fiber, pretty well but....
+ trigger guard.
+ barrel spacers.



Externals review:
* I don't know if I got bad luck. But when I got gun, the upper can't sit tight with stock . at 2/3 the end of outer barrel, it just don't sit flush with nylon stock. I can use force to put it down, but this don't have any screw at the front to hold it so it just jump on . at the rear sit properly. Damm. I think it got stuck somewhere, I will check this later to find out problem is outer barrel or upper or stock..


The nylon stock is well made, I don't see any visible line, very strong and thick.


Magazine can hold about 24 rounds. plasic made , sit flush with magazine housing.



Internals reviews:
+ Since it just S&T version, so it don't have black cylinder like PDI custom version, just stainless steel body cylinder. Maybe price for this gun is limit, the endshaft and end cap of bolt is made by potmetals. Cylinder only have 4 cramped ( like on WELL guns/Cheap guns). I think it can't not hold high fps. DIY is must if you want use stock cylinder to got high power spring.
+ Hop-up chamber clone PDI design, good thing is use AEG barrel, but it have two arm, very very annoy to adjust it.

+ 90* system make this gun pull more easier, and with steel sears, it will withstand with high FPS. Plus point for S&T . Even spring guide and piston is plastic but if you don't want too much FPS, it can holding fine. Mine will replace both of them soon.


Above is some reviews( I will upload pictures later since kind of busy ).


+ plan build/upgrades/DIY/goals: I want to get BEST effective ranges and accuracy. 75-80m or higher is my goals. high fps ( 550-600 ) and good bolt pull.



DIY:

* Fix outer barrel sit tight with stock.
* TDC hop-up, print 3D hop-up arm and mod it ( like this link, i think CYMA and S&T have same design so it will save me some money to build gun):


* Machine spring guide.
* Machine cylinder head if it can't hold 100% airseal.
* Check and fix the barrel spacer to hold tight inner barrel.

Upgrades: ( since some parts is compatiable with vsr-10 like spring, spring guide, piston have to file little bit )


+ Action 90 piston for vsr
+ Inner barrel: PDI 6.08mm 469mm or PDI raven 6.01 455mm or ML CJ 428mm with hot shot/hybrid bucking. Or anything else have good price.
+ Spring: I still not know what spring will have good fps and bolt pull, 9mm or 11mm spring? my plan is push the gun upto 550-600 FPS with .25g.
+ BB weight using: I have .32, .36, .4, .43, .45 g bbs ( BLS and geoff ), What bb weight will suit with this gun. ? Since it have longer inner barrel and longer cylinder than vsr-10, so any advice will be helpful for me.
+ Bucking: Maple leaf monster ( if using aeg inner ) or Hotshot/hybrid bucking ( for GBB inner barrel ). 70* is alright + ML nub or modify flat nub. Or make R-hop/ Surgu patch and flat mod the bucking.


Any advices/ good comment is very greatful for me.
__________________
JG BAR-10 G-spec:JJ trigger, PPS cylinder head,Ele m145, ML CJ inner 410mm. ML autobot 60*. ML hop-arm.

ASP SVU : m175 cutted, flat-hop, miracle inner barrel 469mm.
S&T M40A3: m145 element ( cut fews coil ) spring, steel spring guide, stock modifed piston, action army hop-up chamber, R-hop, hephaesthus 6.03mm 455mm.
WELL Mb-08: Stock for now.
SW M107A1: outer shortened.
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Old 07-31-2018, 06:50 AM   #2
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31/07/2018:

Few upgrades since I stuck on working other guns.
+ Threw stock piston/power spring into box xD.

+ Re-fix Action Vsr-10 piston to fit it in cylinder. smooth and nicely. added tube to keep power spring not get twisted ( and increase piston weight ). Installed M150 APS2 spring ( china brand). I noticed the piston length is little longer than stock piston ( 2mm ). Not sure it will eat my air volume or not?

+ Re-inforced End shaft of cylinder to keep it more durable. 2 screw inserted. Let's it shin.
+ "Re-fix" stock cylinder head. Add silicone pad to decrease noise. Will test it later.
__________________
JG BAR-10 G-spec:JJ trigger, PPS cylinder head,Ele m145, ML CJ inner 410mm. ML autobot 60*. ML hop-arm.

ASP SVU : m175 cutted, flat-hop, miracle inner barrel 469mm.
S&T M40A3: m145 element ( cut fews coil ) spring, steel spring guide, stock modifed piston, action army hop-up chamber, R-hop, hephaesthus 6.03mm 455mm.
WELL Mb-08: Stock for now.
SW M107A1: outer shortened.

Last edited by kazuchan; 07-31-2018 at 06:52 AM.
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