GFC GF25

uniweekendwarrior

uniweekendwarrior

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Hi all,

My mate dropped me off his GFC GF25, I'm guessing their version of the sr25 dmr. The fault with it being it's stuck on full auto. So I'm taking it apart and I get to the selector switch and I'm stuck. On my other rifles there is a screw on the switch to remove it. How do I remove the switch from the GFC.? 

Tia 

 
You don't need to. 

If you're trying to get the gearbox out, you'll need to remove the pistol grip (along with the motor). Once all the body pins are out you should then be able to remove the gearbox. The fire selector has a flat cam disc on the inside of the receiver shell that pushes the selector plate back and forth. Putting it to semi will place the cam in its uppermost position and allow you to easily slide the gearbox out. The fire selector doesn't go all the way through the gearbox - if you rotate the selector while watching the round plate on the opposite side, you'll see that the plate doesn't move. It's just a dummy.

 
Yeah I am trying to remove the gearbox. How the heck do you remove the pistol grip I don't see any screws or anything? I've taken off the base plate and every push pin I can find. 

 
Ermm no haha. I'm out right now so I'll try when I get home and let you know if I'm still stuck. Cheers buddy 

 
uniweekendwarrior said:
Ermm no haha. I'm out right now so I'll try when I get home and let you know if I'm still stuck. Cheers buddy 
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*sucks through teeth* Well, THERE'S your problem, guv.

Have a look at this 






Basically the same - around 4 minutes in he starts taking off the baseplate and removing the motor.

Once you have the motor out, the screws (should be two) inside the top end of the pistol grip are what is holding your gearbox in.

 
I aim to please.

I usually miss and have to adjust for windage but....

 
Thanks I expect I'll have more questions soon enough 

 
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Yea thought so , still buggered though now the motor spins when the gun is switched to semi auto with no trigger pull 

 
uniweekendwarrior said:
Yea thought so , still buggered though now the motor spins when the gun is switched to semi auto with no trigger pull 
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A short circuit - is this a regular trigger gun or a high end Gunfire with ASCU installed ???

The v2.5 gearbox "could" be a JG one with copper selector and "prongs" at rear of switch etc....

gb-e1-er25.jpg


Doesn't really matter if it is a JG or A&K or G&P or CA or whatever....

The main thin is the switch/prongs & selector plate used

A&K & G&P v2.5's don't have prongs at back of trigger switch - but others like JG "might" have

Where am I going with all of this ????

Well if your trigger trolley is stuck in the contacts say, maybe the trolley spring has come off/broke

so it don't return, thus stuck closing the circuit etc....

IF your gearbox had no prongs at back of switch then gun would fire all the time regardless of safety

BUT - if it has the prongs and copper plate like picture....

Then in safety mode the circuit - copperplate/prongs is open and so doesn't fire

The moment you move the selector into semi/auto the plate touches the prongs, completes the circuit

(providing the trolley is stuck in the switch contacts)

and gun goes nuts firing full auto......

Did you forget to connect the trolley spring or fit correctly ????

(think I have forgotten that as well as the tappet plate spring at least once or twice)

Not steaming in but that is what it sounds like to me based on the shooting on semi but not on safe

you could have punctured the trigger wires with the small pin but unlikely unless you moved wires

(or carelessly arranged wires when re-wiring a gun - ergh  I might have done that also but don't tell anybody)

It is some short but think you got the copper plate prong switch perhaps on the gearbox for "safe safety" but "nutz semi"

If all the above is a bit much to grasp - the trolley spring has come off & trolley stuck in contacts

 
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Sitting Duck said:
A short circuit - is this a regular trigger gun or a high end Gunfire with ASCU installed ???

The v2.5 gearbox "could" be a JG one with copper selector and "prongs" at rear of switch etc....



Doesn't really matter if it is a JG or A&K or G&P or CA or whatever....

The main thin is the switch/prongs & selector plate used

A&K & G&P v2.5's don't have prongs at back of trigger switch - but others like JG "might" have

Where am I going with all of this ????

Well if your trigger trolley is stuck in the contacts say, maybe the trolley spring has come off/broke

so it don't return, thus stuck closing the circuit etc....

IF your gearbox had no prongs at back of switch then gun would fire all the time regardless of safety

BUT - if it has the prongs and copper plate like picture....

Then in safety mode the circuit - copperplate/prongs is open and so doesn't fire

The moment you move the selector into semi/auto the plate touches the prongs, completes the circuit

(providing the trolley is stuck in the switch contacts)

and gun goes nuts firing full auto......

Did you forget to connect the trolley spring or fit correctly ????

(think I have forgotten that as well as the tappet plate spring at least once or twice)

Not steaming in but that is what it sounds like to me based on the shooting on semi but not on safe

you could have punctured the trigger wires with the small pin but unlikely unless you moved wires

(or carelessly arranged wires when re-wiring a gun - ergh  I might have done that also but don't tell anybody)

It is some short but think you got the copper plate prong switch perhaps on the gearbox for "safe safety" but "nutz semi"

If all the above is a bit much to grasp - the trolley spring has come off & trolley stuck in contacts
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No idea about the trigger, I believe the guns standard, it's a friends. 

But it is the gearbox with the copper prong safety on the back.

After reading it through twice i understand it haha. I havnt touched the wiring and i dont think i missed any springs I'll check. 

If the contacts are stuck can that only be the spring? Or could corrosion lead to it sticking? If so what's the best way to sort this? 

Cheers 

 
uniweekendwarrior said:
No idea about the trigger, I believe the guns standard, it's a friends. 

But it is the gearbox with the copper prong safety on the back.

After reading it through twice i understand it haha. I havnt touched the wiring and i dont think i missed any springs I'll check. 

If the contacts are stuck can that only be the spring? Or could corrosion lead to it sticking? If so what's the best way to sort this? 

Cheers 
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As your friend dropped it off going nutz on full auto - it sounds the problem is the same

it sounds like there was a short where the moving part - trigger trolley has got stuck in the contacts

It is possible the trolley spring has broken/missing/slipped off so the trolley never returned...

dboys-scar-l-15.jpg


Now there could be other areas but somehow the circuit is shorting out

could be the two red wires - but unlikely to just go like that

I have had a trolley stick in the contacts that was very tight, that even with the spring it stuck

bashing the gun and it released itself in the end

The trolley's top lug - the top white bit could have broken off so the trolley was no longer under tension to return

The spring slipped off, snapped - whatever but something has gone tits up around that location imho

Open up the box, have a look and what you need to do to fix the main problem

Most likely at worst it will be a trolley spring or trolley/switch about a fiver or less to fix

That is my guess atm

 
Sitting Duck said:
As your friend dropped it off going nutz on full auto - it sounds the problem is the same

it sounds like there was a short where the moving part - trigger trolley has got stuck in the contacts

It is possible the trolley spring has broken/missing/slipped off so the trolley never returned...



Now there could be other areas but somehow the circuit is shorting out

could be the two red wires - but unlikely to just go like that

I have had a trolley stick in the contacts that was very tight, that even with the spring it stuck

bashing the gun and it released itself in the end

The trolley's top lug - the top white bit could have broken off so the trolley was no longer under tension to return

The spring slipped off, snapped - whatever but something has gone tits up around that location imho

Open up the box, have a look and what you need to do to fix the main problem

Most likely at worst it will be a trolley spring or trolley/switch about a fiver or less to fix

That is my guess atm
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Looks intact 

View attachment 27088

 
uniweekendwarrior said:
Looks intact 

View attachment 27088
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WELL F*CK ME - I'm shocked !!!!

Two suggestions then - are the contacts the trolley engages still apart or have they been flattened or squished together ???

v2_trigger_switch1-800x800.jpg


why is there a silver wire and a red wire - is there a mosfet in there ???

thought it would be usual black/red

take a pic of whole gearbox with wires n stuff maybe ???

A f*cked mosfet often sticks on - but this would/should mean gun fires as soon as battery is plugged in

(regardless of safety I would of thought)

but check the contacts are still separated - remove the cylinder if need to to check they are still apart

Think them contacts or something is shorting at trigger or them two wires somewhere

 
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