This gun has a pretty storied history all things considered and there have been a number of famous kits, the most notable two being the Poseidon gun that was designed to be built with a Tanaka M29 and the "Vice Alpha" gun that was later recast by SidKit for the infamous all-metal version he offered.
As far as "replicas from slightly obscure anime" go, the Trigun revolver has gotten (and continues to get) a lot of attention over the years.