To change the texture of an RPG without changing the texture of regular crossbows, use this texture pack:https://modrinth.com/resourcepack/rpg-texturepack

The weapon is based on a crossbow and fires explosive rockets instead of arrows. Rockets create a large explosion on impact, non destroying blocks and dealing heavy area damage with realistic knockback. Include firing, reload, and explosion animations, custom sounds, smoke trail, muzzle flash, and explosion particles. The launcher should have a military-style design with realistic proportions and high-quality textures. Optimize the model and textures for Minecraft, ensuring smooth animations and good performance.