Firearm tactical rails; Rifle rails; Rifle stocks; Gun stocks; Rifle hand guards; Rifle hand grips; Rifle fore ends; Firearm attachments, namely, mounts for attaching telescopic sights to a firearm; Firearm attachments, namely, mounts for attaching ancillary equipment to a firearm; Firearm attachments, namely, modular external rail systems for attaching accessories to firearms; Firearm attachments, namely, modular external rail systems for firearms; Firearms; Rifles and parts thereof; Gun barrels; Firearm frames; Firearm actions; Flash hiders for firearms; Blast forwarding devices (BFDs) for firearms; Gas blocks for firearms; Bolt carrier groups (BCGs) for firearms; Muzzle brakes that screw onto a rifle barrel; Muzzle brakes; Muzzle compensators; Component parts for guns, namely, chassis for guns, chassis grips for guns, modular chassis for guns, and modular chassis for guns that provide for a selection of action type, selection of handrail type, selection of stock type, and selection of grip type