AR-15 Schematic - Exploaded Gun Diagrams, Gun Parts AR-15 Schematic Barrels. Bolt Parts. Gas System Parts. Grips. Handguards. Lower Receivers. Magazine Parts. Muzzle Devices. Safety Parts. Sights. Stock Parts. Triggers. Upper Receivers. AR 15 Parts List | Numrich AR 15 Schematic Search the full AR 15 parts list and helpful AR 15 schematic for the exact part that you are looking for from Numrich Gun Parts. Serving the firearms community since 1950, no one has a larger AR 15 parts list for replacements than we do!