発砲ボタンと分解表示付きのThree.js手続き型銃モデル

Build a single self-contained HTML file with Three.js that shows a fully procedural firearm model with no external assets. Model it at real-world scale from named reference stations: a carbine with a collapsible stock, quad rail with panel numbers, red-dot sight, foregrip and bipod, or a compact machine pistol or submachine gun with ribbed housing, threaded barrel and a translucent magazine. Add engraved markings on the sides. Use a dark studio with a narrow overhead light strip so black-on-black parts separate through different roughness values, not colour. Add a small fire button that plays a Web Audio gunshot, a muzzle flash, recoil and ejected brass. Add a disassemble toggle that explodes the model into labelled parts and rebuilds it smoothly. Orbit camera controls. Done means the model renders cleanly, fires, disassembles and reassembles without glitches, and the lettering reads correctly from both sides.