Component parts for guns, namely, firearm barrels, firearm triggers, firearm bolts, firearm grips, firearm magazines, firearm mounts, firearm open sights, firearm muzzle brakes that screw onto a rifle barrel, firearm gas blocks, metal gas tubes specially adapted for firearms, firearm charging handles, firearm upper receivers, firearm lower receivers, firearm bolt catches, firearm magazine catches, firearm takedown pins, firearm receiver detents, firearm roll-pins, firearm anti-walk pins for reducing firearm wobble, firearm butt-stocks in the nature of butt plates for pistols, rifles, and shotguns, metal buffer tubes specially adapted for firearms, firearm castle metal nuts specially adapted for firearms, firearm hand guards, firearm tactical rails, metal springs specially adapted for firearms, firearm buttons, firearm sling plates in the nature of swiveling gun mounts, firearm side plates, firearm levers, firearm trigger guards, firearm magazine releases in the nature of a button specially adapted for firearms for changing the magazine, firearm slings, firearm flash hiders in the nature of firearm silencers, firearm compensators in the nature of muzzle brakes that screw onto a rifle barrel, firearm jigs specially adapted for firearms for casting or forging lower receivers for firearms; Firearm cases; Firearm bipods; Firearm monopods