So I finally got around to open it up. The hop-up rubber was a poor shiny rubber of the likes you would find in old Well VSR10 clones. The inner barrel is NOT standard. It's not VSR/GBB compatible out of the box. It would be easy to modify the hop-up chamber to accept them, but then you would have no barrel retention other than the hop-up rubber itself. That's probably why TNT is selling only barrel+hop-up chamber combos. Modifying a VSR/GBB barrel to fit in the stock chamber would be possible, but would require a lathe or a VERY steady hand (there's an extra ring that goes all around the barrel).
The stock barrel was bridged, but the bridge was very tiny, unbridging it was a 5 minutes job with a snip and a file. I got the ML Autobot rubber in, teflon taped it and everything went right in. The hop-up nub was much bigger than the poor sorry thing in the TNT diassembly video and I kept it. The gun will now overhop 0.36g BBs without a problem and the FPS has gone up a bit, though I am not done chronoing heavy weight BBs yet.
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