Transformers Generation 1 Mainframe with Push-Button (1990)

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The 1990 Transformers G1 Mainframe with Push-Button is an Action Master featuring a non-transforming 3¾-inch robot figure with an uncertain alternate mode, styled like a large vintage computer. Mainframe has swivel neck, shoulders, and knees, ball-jointed hips, 3 mm hand holes, foot ports for vehicle attachment, and a 5 mm-compatible back port. He comes with a Vibro Pulverizer rifle and his partner Push-Button.

Push-Button transforms into a large cannon that Mainframe can carry, although its oversized design makes the weapon somewhat awkward to handle. As part of the second individually carded Action Master assortment, Mainframe is a distinctive 1990 G1 figure that combines classic Transformers accessories with the non-transforming Action Master format.