Equip your AR-15 platform build or restoration project with the precision-engineered Ruger 91005 AR Upper Parts Kit. This factory-original components package supplies the essential elements needed to complete or repair the forward assist and ejection port cover assemblies on compatible upper receivers. Key Features Complete Forward Assist Assembly - Includes the plunger, retaining pin, and spring for reliable manual bolt closure assistance. Full Ejection Port Cover Assembly - Features the dust cover door, hinge pin, retaining clip, and torsion spring to protect the action from debris. Ruger Factory Specifications - Manufactured to Ruger's exacting standards for consistent fit and function on AR-15 pattern rifles and pistols. Durable Phosphate Finish - Provides corrosion resistance and a professional matte black appearance. Specifications Manufacturer Part Number: 91005 UPC: 736676910052 Compatibility: AR-15 / M4 pattern upper receivers Contents: Forward assist assembly with pin and spring; ejection port cover with hinge pin, clip, and spring Dimensions: 5.9 in (L) x 4 in (W) x 1 in (H) Weight: 2.16 Country of Origin: United States Why Choose This Product Builders and gunsmiths rely on genuine Ruger components to ensure proper operation of critical upper receiver functions. The 91005 kit streamlines assembly by delivering all seven required small parts in one convenient package, helping maintain the reliability and safety expected from AR-platform firearms. Whether completing a stripped upper or replacing worn components, these parts address common maintenance needs without compromise. Note: Due to variations across AR-platform manufacturers, compatibility cannot be guaranteed with every firearm. Professional installation by a qualified gunsmith is recommended for optimal safety and performance. Common Applications New AR upper receiver builds Restoration of existing uppers Spare parts inventory for range or duty use