just remove the grub screw put the barell nut back on with everything else and test it. that should solve the issue.

[IMG]http://i.imgur.com/XNauGtA.jpg[/IMG]

the above pic shows the inner barrel inside the outer, but seperate from the receivers...
you can see the set screw that would hold the hop up in place.
Thanks for sticking with me Hectic, i'll give that a shot when I get home today.

nice gun pron btw. love the 416. love pretty much anything H&K

So I removed the set screw and re-assembled normally, minus the set screw. And it would not shoot. The bbs just filled the barrel again. So, I took it apart, reinstalled the set screw, and tightened it all back you. And I'm back at square 1... Thanks for your help.

What did you do to the gun befor the issue started? Did you change the hop up rubber or something?

It was changed recently yes. But I did have it working with the new rubber

Well if bbs are jamming either the hop it turned too high or the rubber is too hard or something just isnt workin with the setup.
Temprature can make issues too but it should be warm enough now.

Re: barrel/hop up problem M4 platform
 

Does it shoot without the rubber?

Edit: even better...does it jam if you hand feed the bbs?

! On mobile; sorry for any spelling mistakes or autocorrects!

It does not jam if I hand feed. (I can easily push the bbs past the hop and down the inner.
I haven't tried it without the rubber.
The rubber is soft, it does it with the hop turned all they up or down, and it does it in my basement. (~25°c)
I'm almost ready to bring her to the doc...