ProWin 8mm Split Mechbox

[TokyoSeven]

For your sakes I hope its not crap too Cushak, that would totally not be good.

[Voodoo]

Im shooting the M100 spring for indoor and it gets the same range as an M120 in a systema mechbox. I will post a pic of the inside of the mechbox when i have it apart to clean it this week. It isnt very hard, just get a dremil. Most of the grinding is on the right side of the lower mechbox to accomedate the spring release.

To change the spring you need to take your stock off and the front&rear body pin, it take about 15min to do the first time.

[kashimaa]

Originally Posted by ILLusion

1 Yes, a Systema switch assembly will fit
2 For your setup, I'd highly recommend either the Prometheus Max Torque gear set or the Systema Infinity torque up gear set
3 You will require a half-tooth piston to work with either of those gear sets.
4 You have no choice as to helical or flat with those gear sets... they ONLY come in helical teeth
5 I'd also recommend a MOSFET for your setup so that you don't burn out your contact plates
6 I'd also recommend a high torque motor, such as a Systema Magnum motor
7 Bore up cylinder kits will fit - the kit comes with the appropriate nozzle, so no worries about the PGC one
8 What do you mean by "lay the wire backwards"? Do you mean to the rear stock? The gearbox is built to allow wiring to either the front or the back of the gun, but it's easier to get it to rear power

you SPR looks great! and with its internals it is realy realy highend, nice job!

1 nice, so most of the common gb v2 internals should fit.
2 you are right and i meant those gears, just too lazy to search for the correct productname ^^
3 so half theet will fit, thx!
4 i could not believe the heli-only but damn, you are right ...
5 mosfet rocks, i know but thx
6 same with systema magnum motor
7 sry, missunderstanding, but you finaly answered my question and gave me an new one, too hehe: wich nozzle do you prefer for this setup and the prowin box?:
deepfire cylinder type 0
deepfire pistonhead (alu)
deepfire cylinderhead
(all bore up)
8 thats exactly what i meant so, good news for my plan, thx.


i think i will give that gb a try, or 2 .. or10 hrhr.

@ Skruface, you are right, thx
@ cushak, maybe ist was just a crappy info ;p i realy dont know, i read that anywhere. you got my best wishes
@ voodoo also thx for your support! i think i am not the only one who want those pics

your all great, you answered more than i questioned

[Dynamo]

Originally Posted by Voodoo

To change the spring you need to take your stock off and the front&rear body pin, it take about 15min to do the first time.

that depends on if your M4's stock bolt goes into the spring guide, or into the backplate of the lower reciver.

mine bolts to the reciver so i just pop the two reciver pins, then the pin (replaced the screw with a pin for quicker removal) that holds the back of the gearbox.

[ILLusion]

Originally Posted by Cushak

I hope it's not crap; I just ordered one.

It's not "crap", but there are some minor workarounds that you'll have to deal with that were fixed when the 8mm version was released. Hence, the cheap price that I let the 7mm go for.

Issues that I've noted in the past through various threads:

1. Sub-par build quality plus non-standard dimensions of the piston (which is why I included a modified version of the Prometheus piston)

2. The cylinder head requires either:
a) a front-shim to push it back
b) a locking rolling pin to hold it in place (the instruction include details on this, and a hole is already drilled through the gearbox to accomodate this. You just need to locate a pin that was never included in the kit.)
Failure to lock the cylinder head back in place can and will result in either a damaged tappet plate, or (more likely), a damaged piston and possibly damaged sector gear.

If the cylinder head is located properly, then you should actually be able to run the PGC piston no problem for many many rounds. Mine broke because I failed to notice the proper location of the cylinder head on initial installation. I initially blamed the PGC piston, but when I noticed strange grinding noises and abnormal grinding marks on the first tooth of the Prometheus piston, I inspected further and realized that the cylinder head was sitting too far forward, causing the piston to also sit too far forward.
The result is that the sector gear was engaging the piston teeth incorrectly, causing the issues. The pressure on the PGC piston caused it to snap.

As far as I know, this cylinder head issue is still not fully resolved in the 8mm version, but the piston dimension issue has been.

Again, as has been mentioned many many times, this gearbox is NOT for the faint of heart and only recommended by people familiar with upgrades, modifications, diagnosing and troubleshooting.

Beyond that, I don't see what's so "crap" about the 7mm version. I never saw anything that ever made me regret getting the gearbox. Consider that you're dealing with the first generation of the next evolution of the standard AEG gearbox. Perhaps you could enlighten us, kashimaa?

Originally Posted by Voodoo

To change the spring you need to take your stock off and the front&rear body pin, it take about 15min to do the first time.

If installed according to the instructions that come with the PGC gearbox, you shouldn't need to take off your rear stock at all - just like real steel or a Systema PTW, the bolt to attach the stock would go from the inside-out rather than outside-in and secured by a nut. It's a bit of a pain if you ever have to take your stock off, but if you don't, it'll save TONS of headaches for field-stripping the gun. If you watch the videos that come on the installation disc, you'll see them completely strip the upper off, swap the spring and reinstall everything together again without ever having to take off the stock. A spring swap can be performed in about 30 seconds. Ultimately, you don't *HAVE* to do it this way, but if you want full access to the quick-swap feature, this is definitely the way to go.

Originally Posted by kashimaa

you SPR looks great! and with its internals it is realy realy highend, nice job!

1 nice, so most of the common gb v2 internals should fit.
2 you are right and i meant those gears, just too lazy to search for the correct productname ^^
3 so half theet will fit, thx!
4 i could not believe the heli-only but damn, you are right ...
5 mosfet rocks, i know but thx
6 same with systema magnum motor
7 sry, missunderstanding, but you finaly answered my question and gave me an new one, too hehe: wich nozzle do you prefer for this setup and the prowin box?:
deepfire cylinder type 0
deepfire pistonhead (alu)
deepfire cylinderhead
(all bore up)
8 thats exactly what i meant so, good news for my plan, thx.


i think i will give that gb a try, or 2 .. or10 hrhr.

@ Skruface, you are right, thx
@ cushak, maybe ist was just a crappy info ;p i realy dont know, i read that anywhere. you got my best wishes
@ voodoo also thx for your support! i think i am not the only one who want those pics

your all great, you answered more than i questioned

There's nothing wrong with helical gears - if you're working with gears of a torque level of this caliber, you'd BETTER know how to shim, because if you don't, that's actually the least of your worries. You might as well forget about getting a Pro-Win gearbox if you're worried about such a minor issue as shimming.
When installed correctly, helical gears perform better than flat gears.

I'm not too familiar with Deep Fire products, but I tend to recommend the same brand of air nozzle as the cylinder head you buy. So if you get a Systema cylinder head, get a systema air seal nozzle, if you get a guarder cylinder head, get a guarder air nozzle, and if you get a Deep Fire cylinder head, get a Deep Fire air seal nozzle. Simple as that. There isn't much difference between the brands, but there are minor fitments differences between the brands due to outer diameters of the cylinder nozzle base and the inner diameter of the air seal nozzle itself.

If you look around on the net, there is a site or two that has posted the pictures that were included with the gearbox. Unfortunately, I just shipped out the gearbox that I had in stock, so I no longer have the images on that disc anymore. There was a website I found that was based in France that had a very detailed and technical thread on the gearbox and had all of the images posted up from the installation disc.

[Cushak]

Awesome, thanks for the info.

[kashimaa]

Originally Posted by ILLusion

Perhaps you could enlighten us, kashimaa?

i search for prowin infos months ago. all i could find was this french side which i dont understand, and a couple of whining user in germany and swizz forums ;p
most of them said its too hard to install and they got no solutiuon for the jamming problem. thats all.
at this point i stopped the research until yesterday - i found a german retailer with that 8mm box in stock and this forum

[ILLusion]

Originally Posted by kashimaa

i search for prowin infos months ago. all i could find was this french side which i dont understand, and a couple of whining user in germany and swizz forums ;p
most of them said its too hard to install and they got no solutiuon for the jamming problem. thats all.
at this point i stopped the research until yesterday - i found a german retailer with that 8mm box in stock and this forum

I noticed that as well.

I'm the kind of person that finds a way to make something work when it doesn't work "right away."

There's always a fix, it just needs a bit of inspection and ingenuity. We're given a brain for a reason!

Regarding that jamming issue - that's what I ran in to as well, and as I mentioned, it is related to the cylinder head sitting too far forward. Once it's located properly and fixed in place, it should pose no problems.

[kashimaa]

hehe but what you said is true, so i will start with the GB building from scratch (?) with a normal one (Deepfire 7mm reinforced). when i get this thing working i will try the prowin box.

give me 2-3 month and i will be back with perhabs a lot of questions thx for your great support so far!

[plasticsoldier]

any ideas of what hop rubber is good to use for a high rof gun on the 8mm gearbox???

[ILLusion]

That depends on what velocity you're shooting.

I'd recommend models by Systema, Firefly or Prometheus.

[Double Tapper]

with a gauder M16A2 metal body,how much filing is required and where.
I'm looking into getting the prowin8mm.

[Dynamo]

like i said in the PM, any quality hopup sleeve will work, just dont use the one that comes in the kit (openning is too narrow and will cause back pressure in the cylinder).

[Jayhad]

Originally Posted by Double Tapper

with a gauder M16A2 metal body,how much filing is required and where.
I'm looking into getting the prowin8mm.

Voodoo spent hours grinding on his guarder and couldn't get the prowin to fit, he later just got a G&P body

[Double Tapper]

This sounds like I should build this new gun from scratch,
Sounds exspensive but fun.Do G&P have C7 trade marks?.