Hegs44 Posted October 15, 2015 Posted October 15, 2015 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 Posted October 15, 2015 Author Posted October 15, 2015 Or I just get a whole new quick change gear box with all the bells and whistles pre done. Suggestions. #ItsOnlyMoney
Supporters Sitting Duck Posted October 15, 2015 Supporters Posted October 15, 2015 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, dex and ak2m4 3
Hegs44 Posted October 15, 2015 Author Posted October 15, 2015 Outstanding. Ta "You can have my gun when you pry it from my paranoid, mentally disturbed, physically-abusive, cold, dead hand."
dex Posted October 15, 2015 Posted October 15, 2015 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. Sitting Duck 1
ak2m4 Posted October 15, 2015 Posted October 15, 2015 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.
Supporters sp00n Posted October 15, 2015 Supporters Posted October 15, 2015 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
Supporters Sitting Duck Posted October 15, 2015 Supporters Posted October 15, 2015 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 sp00n 1
Hegs44 Posted October 16, 2015 Author Posted October 16, 2015 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.
Supporters Sitting Duck Posted October 16, 2015 Supporters Posted October 16, 2015 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 Hegs44 1
Supporters sp00n Posted October 16, 2015 Supporters Posted October 16, 2015 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
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