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You need to cut material away for the gears to clear the side of the receiver. Also the cylinder unit is the same dimensions as RS except it is wider at the rear end the receiver so material must be ground away there too but not much. From there everything else fits.
It's my second converted upper so I knew what I had to do and with just a dremel it took me about 2 hours. Didn't want to go too fast. Also that is with alot of sliding the cylinder in then noting where a bit more had to be removed etc.
The front sight is a little tricky as I got one with pre-drilled holes that didn't line up properly with the cut-outs on the PTW barrel but I just threaded the holes and used 4 grub screws.
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