G36 firing oddly in semi (1BB,2BBs,1BB,2BBs,1BB etc.)

[CDN_Stalker]

I find that in semi the nozzle ends up at all kinds of various places, halfway, full back, almost full forward (2mm from breech). Really, there's nothing you can do about that, they all do that in semi. Only way I can get the nozzle to sit full forward is to fire in full auto until it rests full forward.

I stil say the hop up wasn't installed preperly, that's largely what causes double feeding, the nub is too far forward, enough that a second BB can get in the nozzle's path.

[Sha Do]

Just a point to add here;
I have noticed that when changing hop up buckings (as I do to about 15 AEGs every season...team gun maintenence...every spring), I have found that when working with full metal hop up units and/or tight bore barrels, that I have to be particularly careful when sliding the barrel back into the hop up unit not to have the hop up bucking pull forward, as this results in the feed end of the bucking stretching into an oval shape. This slight "out of round" causes the nozzel to catch the excess hop up material and jamb when feeding a BB.
This is a real pain when trying to initially instal new full metal hop up units, and I have found it to be a very common problem.

SHA DO

[Mighty Mouse]

well I shot a low cap off and did not get a single double feed in semi. The problem might come up again with more use but for now its off my mind. I think it all came down to the hop sleeve. I noticed that it was pulled off the barrel just a little bit and probably had the oval thing goin on, and the feeding end protruded too far back. After a quick adjustment to the sleeve it all seemed to work.
It is just the consistency of the 1-2-1-2-1-2 shot pattern that boggles my mind. It wasn't just a random double feed here and there, it was every other shot without fail.
A simple solution to a complicated problem..for now...

[Dynamo]

i had this issue with my G36 when i first got it, the problem is fairly easy to fix.
its not the tappet plate or the nozzle. its in the hopup assembly.
if you look at the hopup assembly, on the underside of the area just befor the entrance to the hopup openning, there is a small spring mounted ramp.
that ramp is there to stop BB from being pushed into the hopup more than one at a time, but if the mag spring is a little too strong it will push a second BB up and the first BB forward.
to fix this all you need to do is take apart that ramp assembly and replace the orriginal spring with a stiffer one. thats it, and after that it should feed fine.

[Mighty Mouse]

thanks Dynamo. I was wandering what the ramp was for.

[Kos-Mos]

I had the same patern double feeding problem with a felow's AUG. Ended that the hop chamber was damaged.

Changed for a PDC metal one, no problem since then.