Explanatory notes
… special mountings for guns, machine‑guns, sub‑machine‑guns, etc., whether or not with aiming and loading mechanisms. … for military small arms, sporting and target shooting guns, etc., revolvers and pistols , e.g., barrels, breeches, … ejectors, frames (of pistols), plates, butt plates, safety catches, cylinders (for revolvers), front and back sights, …