Firearms; Rifles; Guns; Component parts for guns; Component parts for rifles; flash suppressors, flash hiders, blast suppressors, and muzzle brakes for firearms; muzzle devices for firearms, namely, flash suppressors, flash hiders, blast suppressors, and muzzle brakes; Firearm attachments, namely, modular external rail systems for attaching accessories to firearms; Firearm attachments, namely, modular external rail systems for firearms; Firearm tactical rails; Rifle fore arms