Why is this the "best" weapon asset? Because it shatters the Mario ethos. Mario doesn't use ranged weapons (Fireballs are magic, not mechanical). Seeing a high-poly bolt-action crossbow in Mario’s hand is jarring, violent, and incredibly cool. It suggests a brief period where Super Mario 64 flirted with action-adventure RPG mechanics.
No single official pack exists, but you can assemble one by downloading from: super mario 64 beta assets best