I can't get my GR16 GBBR to shoot

[Mr Monkey Nuts]

Is the rubber O ring still in place on the round silver metal gas inlet on the top half of the box? And is the hop up unit pushed all the way forward into the receiver, it's a very tight fit to get them to align properly and seal up.

With these if you push the mag too high or pull the mag slightly back, it can prematurely trigger the valve, if you look at a g5 mag the valve is recessed for this reason.

So if you have to push it to line up, then I would assume the main hardware isn't in place properly.

Could you take the top reciever off and take a top down picture with the magazine in place so I can see how it's sitting?

 

[MrCheesman94]

Is the rubber O ring still in place on the round silver metal gas inlet on the top half of the box? And is the hop up unit pushed all the way forward into the receiver, it's a very tight fit to get them to align properly and seal up.

With these if you push the mag too high or pull the mag slightly back, it can prematurely trigger the valve, if you look at a g5 mag the valve is recessed for this reason.

So if you have to push it to line up, then I would assume the main hardware isn't in place properly.

Could you take the top reciever off and take a top down picture with the magazine in place so I can see how it's sitting?

Click to shrink...

 

[Mr Monkey Nuts]

When you cock the hammer the pin come back and sits perfectly over the valve?

Although I still think this sounds like a gas issue, have you tried it with a different can of gas and with warm (room temp) mags and gas?

 

[MrCheesman94]

When you cock the hammer the pin come back and sits perfectly over the valve?

Although I still think this sounds like a gas issue, have you tried it with a different can of gas and with warm (room temp) mags and gas?

Click to shrink...

Yes i have it have tried it with a brand new just open can of nuprol 4.0 and same effect

 

[PT247]

Click to shrink...

comparing your pic to how my G5 looks the striker does not look low enough in your pic or very central (although that could be just the angle)

 

[Mr Monkey Nuts]

That's with the hammer not cocked, when it's cocked it draws the striker back. It's should look like this



If you remove the bolt half from the upper reciever and place it on top of the trigger half with the mag in, does it form a very close fit and does the gas route fit into the magazine fully? The two halves should mate perfectly and There should be less than 1 mm clearance near the magazine.

Failing that, it's going to be a full strip, clean and re lube of the cylinder and bolt assembly. If it is dirty and giving a bit of extra resistance it could be slowing the action down enough to just dump all gas. As it relies on the bolt fully cycling to re cock the hammer and draw the striker back. If it doesn't re cock the trigger it leaves the striker foreward engaging the valve.

 

[MrCheesman94]

That's with the hammer not cocked, when it's cocked it draws the striker back. It's should look like this



If you remove the bolt half from the upper reciever and place it on top of the trigger half with the mag in, does it form a very close fit and does the gas route fit into the magazine fully? The two halves should mate perfectly and There should be less than 1 mm clearance near the magazine.

Failing that, it's going to be a full strip, clean and re lube of the cylinder and bolt assembly. If it is dirty and giving a bit of extra resistance it could be slowing the action down enough to just dump all gas. As it relies on the bolt fully cycling to re cock the hammer and draw the striker back. If it doesn't re cock the trigger it leaves the striker foreward engaging the valve.

Click to shrink...

i'm assuming that means mine is to far forward because the picture is not cocked on mine and it pushes the strike pad up

 

[Mr Monkey Nuts]

No yours is correct for when the hammer is not cocked, it can't fire and simulates the bolt being locked back. When you cock the hammer, it should line up like the one I pictured.

 

[MrCheesman94]

i have fixed the problem turns out the o-ring thats on the valve of the top half of the the gas box had been pushed up and loosened so found another one put it in place and no it works simple lol

 

[PT247]

nice one