Component parts for rifles; Firearm attachments, namely, modular external rail systems for attaching accessories to firearms; Firearm attachments, namely, mounts for attaching accessories to a firearm; Firearm attachments, namely, mounts for attaching ancillary equipment to a firearm; Firearm hand guards; Firearms; Grenade launchers; Gun barrels; Muzzle breaks that screw onto a rifle barrel; Silencers for firearms