The RGX 621D was discontinued in 1995, but sold for around $800 when new. The RGX 621D's pickups were directly mounted to the guitar's body. The RGX 621D model had a custom scalloped fretboard from the 20th to the 24th frets. This feature was intended to help fast and accurate fingering.

The RGX 621D had a Yamaha height-adjustable locking nut. This allowed players to customize the action and feel of their guitar based on playing style and string gauge preference.

The body was alder. The neck was maple, with 24 fret rosewood fingerboard.

Pickups were two humbuckers (neck and bridge positions) and one single coil (middle position). The controls were a five position pickup selector and master volume and master tone controls.
The bridge was a TRS-Pro locking tremolo. All hardware was black chrome finished.

Finish options were Antique Sunburst Satin, Black, Blue Metallic, Red Metallic and Natural Satin