Future tech stealth weapon brainstorming

• Cold fusion pistol (zero IR emissions)
• Infrared laser rifle (invisible bolts - Or is it a beam? Nobody knows.)
• HEIAP pea shooter (very silent, compact and undetectable blowgun - until the target is hit)
• Electrononmagnetic shotgun (made completely out of plastic, extremely stealthy, thus got a massive nerf and now only comes in various bright colors)
• Buckslingshot (for very soft targets - also available as birdslingshot)
• No-shot-one-kill imagination beam launcher (extremely heavy, difficult to carry by one person - the lighter models had too many misfires)
• Mithril crossbow (Not only very silent by design, but its existence is still being widely denied, thus making it very attractive to criminals - From a court transcript: "That mithril bolt tore your arm right off!" - "No, it didn't.")