G&G V2 Gearbox Spec

[Hegs44]

Hi all

I have G&G CM 16 SR. Has a " V2" gearbox.

I'm pre-planning upgrades of cyclinder, piston head and maybe gears and bushings etc

I would like to know what the current spec is of the internals of the stock gearbox.

Not found anything on open source.

ie. Ratios ? Piston teeth ? Bushing size ? Etc

Don't want to open it all up yet to apply micrometer.

Thanks

 

[Hegs44]

Or I just get a whole new quick change gear box with all the bells and whistles pre done.

Suggestions.

#ItsOnlyMoney

 

[Sitting Duck]

8mm bronzey bushings usually on 99% of them

(FireHawk has 8mm bearings for some reason)

These softer bronzey bushins do wear so replace with shs bushings over time

Gear ratios are "usually" 18:1 - though oddly FireHawk seems to be 21:1

most gearboxes use 18:1 as stock std gears - a few makes may use 16:1 but reckon 85% use 18:1

(some other types like L85's M14's may use 21:1 gears in longer stroke gearboxes but 18:1 is the "norm")

Piston is a 16 tooth type - well sometimes referred as a 15 tooth if 2nd tooth is removed/missing for AoE

But it is still a 16 tooth piston really coz sector gear has 16 teeth on std aeg gearbox

Think the cylinder spec is about 72mm x 23.8mm internal diameter - yup think that is about it I guess

screws to open G&G v2's are located on opposite side to a std non blowback box

don't know why but G&G put screws underneath on regular v2's - though think blowback's are on top

screws 90% will be allen key types - but some are still the odd phillips screws

Upgrades......

double o-ring cylinder head

o-ring nozzle

new piston head - better plastic one

cylinder - usually fine unless port is incorrect

Correct AoE, sorbo/neoprene pad

check seals etc......

grease blah blah blah

you have a mosfet fitted anyway - can't say how robust it all is but a fet is there all the same so donkey work is done

TBH - leave it as it is for now - you have a fet so you could run on higher juice for a while

Then eventually when it NEEDS to, either it needs a service or she wears a bit or something busts..

THEN - re-do the box with tweaks/service/repair etc.........

That is my best advice - if it ain't broke.... etc.....

Even if you buy another "enhanced" or "upgraded" box it will still most likely need a tweak here n there

Quick change spring boxes are nice but on M4's you still gotta remove most stuff to change spring

just you haven't got to open box - but still gotta do 90% or removal to get to rear of box

(unless you wanna drill out a big dirty hole at back of receiver and need a stock change/adapter)

yes on some other guns (APS UAR) the quick change spring works great and 30 sec spring change but not on M4's

on a tweaked box you are gonna be looking at £100 aprox for a mofo lonex box

a £40/£50 gearbox will be nigh on just a std box and G&G boxes are pretty nice to work on with good compatibility

Leave it as is for now, run a bit more juice maybe

then say 6 months or so then get her tweaked and serviced a bit, drop in a neo motor and she will be lovely

BTW not saying run on 11.1v with a high speed neo motor trying to hit 30rps - that is silly

doing that will lead to piston pickup tooth snapping off - coz did that twice at first

but a little more juice or maybe a motor on 7.4v getting up near 20rps should be ok for a little while

probably replace small tamiya connectors with deans is cheap easy tweak

 

[Hegs44]

Outstanding. Ta

"You can have my gun when you pry it from my paranoid, mentally disturbed, physically-abusive, cold, dead hand."

 

[dex]

I'd second the advice of leaving well alone unless there is a specific reason to upgrade, less is definitely more when it comes to "upgrading" AEGs. Definitely swap out the Tamiyas for deans tho.

Also consider buying a second hand gearbox to upgrade and tinker with, teach yourself with that and when you have something that works well, drop it into your AEG. That way you always have 1 working gearbox.

 

[ak2m4]

As duck says use it and enjoy it for now. When you feel like dipping your toe get yourself some second-hand parts and build yourself a custom "backup" M4 that you can tweak to your hearts content.

 

[sp00n]

Just want add my g&g sr25 had 8mm ball bearings, but the ratio was abit high for my liking in any case it's jacked now

 

[Sitting Duck]

Ahhhh that might have had them weird 21:1 gears in there too.

You could of changed to say 16:1 or something but gotta watch for PE on them longer stroke boxes.

(Presume it was a longer v2 box like A&K 25's)

Anyway it's jacked now so job done

 

[Hegs44]

Airsoft Colleagues,

Absolutely brilliant and wise advise.

I shall "Keep Calm and Carry In Airsofting "

Yeah the gun is currently averaging 309 to 318 fps and working fine.

Thanks again.

 

[Sitting Duck]

it's fine as it is, you not have to hit 349.9999fps

TM's often are about 300-ish but still bad ass mofo's

I'd rather have 300fps accuracy than 349.99999 all over the f*cking place

give barrel a little clean may help (dirty barrels lose fps)

(if you are not sure just clean 85% of barrel length to avoid dirt/contaminating hop bucking)

eventually if/when she drops below 300 or it don't seem so great

then start to consider options but for now:

deans & clean barrel with help

 

[sp00n]

Ahhhh that might have had them weird 21:1 gears in there too.

You could of changed to say 16:1 or something but gotta watch for PE on them longer stroke boxes.

(Presume it was a longer v2 box like A&K 25's)

Anyway it's jacked now so job done

No it's just a standard v2 with a hell of a long nozzle lol