Crafted from polished, hardened brasslite (a brass-plated alloy), giving it a brilliant "golden" look. Stock: Typically features high-grade American Walnut stock.

Based on the search results, there are a few potential interpretations for "Golden Boy (US)," but the most likely context, given your request for a "solid piece," refers to the Henry Golden Boy 22LR lever-action rifle

(specifically special U.S. editions like the Border Patrol tribute). Here is a solid overview of the Henry Golden Boy The Henry Golden Boy

is a staple of American-made lever-action rifles, renowned for its classic styling, smooth action, and high-quality finish. It is styled after the original 19th-century lever guns.

The " Golden Boy " series, which was added to anime streaming services in the US.