New answers tagged moc
The bit held in the mech hand is a Ray gun. The bit on the forearms is almost certainly a short bit of Hose, Ribbed 7mm D. 2L like zovits said.
It is a Tile 1 x 1 Round, with groove Edit after clarification in the question: The arms have something that looks like a bit of Hose, Ribbed cut to the required size. The gun is, as gev pointed out, based on a standalone ray gun piece that has the ribbed section molded in originally.
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