[Mysteryfish]

Okay, so I fixed it.

The inner barrel / hop-up are on a spring loaded assembly which twist locks into the forward section of the gun.

This section pushes backwards and stops, resting against the front face of the mechbox.

It was too far back, and a flat piece of the hop-up assembly was actually partially blocking the path of the BB's into the gun.

My solution: built up an aluminum tape 'pad' on the face of the mechbox to shim the inner barrel and hop-up assembly forward so they were not interrupting the path of the BB's

What I can't understand is why the hell it's in the way in the first place?

I have a feeling I've got an aftermarket mag-well on this gun, but I'm really not sure.

It's either that or I'm missing a component that holds the hop-up further forwards.

*addendum: I'm apparently not missing any components, as I looked carefully at a few exploded diagrams, which revealed no mystery-part.

does anyone have any idea why my inner barrel and hop-up would be sitting too far back?