-Flash hider is 100% aluminium. The exposed bits had minor scratches on, its definitely aluminium.
-Behind the flash hider looks darkened black.
.....
-The mgc barrel was cut approx 1cm shorter than the edge of the flash hider. Its plugged and the plug is black.
-Inside the hood of the flash hider is darkened with the same weathering as on the outside.
-It is a black rattle can overspray weathering job.
-The lines are not pencil, it's like a 2mm marker pen. A little translucent or perhaps ink fading has occured.
-The spacer is made from 2 things. An approx 8mm brass thing, straight edges. Ontop of this is some silvery metal thats about 2mm thick. They are identical diameters and are about 2.5mm wider in diameter than the thorens above.
-Actually, the thinner spacer component looked the same thickness as the thorens but was 2.5mm (ish) wider.
-Thorens staining is a grey gloopy looking filler or glue that is unknown to me. Its about 1cm in diameter but irregular as you'd expect. It's slightly glossy in an irregular way. The closest colour match I can think of is the old lego light grey colour.
-Thorens is screwed on with phillips screws. Maybe 3.5 or 4mm screw heads, domed head. Don't know the official engineer name - panhead?
-The screws don't overhang the thorens at all. Theyre flush with the edge completely.
to be official and thorough