Real Grade (RG) is a line of Gunpla kits that was introduced by Bandai in 2010 as part of the Gundam 30th Anniversary commemoration project. These consist of Mobile Suits from both the Universal Century and the Alternate Centuries. The RG line combines the best aspects of the other three Gunpla lines: The small size and affordable prices of the High Grade, the advanced inner frame technology of Master Grade, and the massive parts count and details of the Perfect Grade. The tagline for the RG line is "Excitement Embodied". Also, the RG line reflects what a mobile suit would look like if it were built in the present day.

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Reference: https://gundam.fandom.com/wiki/Real_Grade