The RGD321 is an RGD series solid body electric guitar model introduced by Ibanez in 2010 at the Summer NAMM Show. It was made in Indonesia.
The RDG321 was the first hard-tail model in the RGD series, which is a line of metal-oriented guitars. The RDG series is aimed at players who want to tune below concert pitch from the start, but are set up to be able to use regular gauge string sets because of the longer-scale neck. No more .60 low-E (D, in this case) strings to get murderous tunings! Drop C (My Curse by Killswitch Engage) is as simple as dropping your low-D down to match the C's vibrations. Drop B? Easy, too. It's ready to rock right from the factory.
The RDG321 features a basswood body bolted to a 26½" scale maple neck with a 24-fret rosewood fingerboard with special Ibanez checkmark position markers. Components include Gibraltar Standard fixed bridge and a pair of Ibanez humbucking pickups optimized for downtuning.
The RGD7321 is a similar seven string model. The RGD320 and RGD320Z are similar models with tremolo bridges.