Use the quality components included in this Geissele Ultra Duty Lower Parts Kit to build a more reliable weapon that will last significantly longer than with stock parts. All key components of these Geissele AR15 Lower Parts are made from stainless steel that resists rust and can withstand brutal conditions in the field. Every Geissele CP-05-435 Ultra Duty Lower Parts Kit comes with an Ambidextrous Super Configurable Safety that provides you with positive tactile feedback when entering the safe or fire position. You'll also get their renowned Maritime Bolt Catch that features aggressive texturing and extended paddles for an easier grip. Trust the Geissele Ultra Duty Lower Parts Kit, No Grip when you need to complete or rebuild your firearm's lower receiver. Specifications for Geissele Ultra Duty Lower Parts Kit: Manufacturer: Geissele Finish: Type 3 Hard Coat Anodized Fabric/Material: 7075-T6 Aluminum Condition: New Country of Origin: USA Package Contents: Geissele Ultra Duty Lower Parts Kit 1. Takedown Pin & Pivot Pin Detents (2) 2. Takedown Pin & Pivot Pin Springs (2) 3. Checkered Takedown Pivot Pin 4. Bolt Catch Plunger 5. Bolt Catch Spring 6. Bolt Catch Coiled Pin 7. Maritime Bolt Catch 8. Safety Detent 9. Buffer Retainer 10. Buffer Retainer Spring 11. Safety Detent Spring 12. Checkered Takedown Pin 13. Magazine Release Button 14. Magazine Release Spring 15. Semi-Auto, Ambi Tapped Safety Selector Assembly 16. Magazine Catch 17. Coiled Trigger Guard Pin 18. Geissele Ultra Precision 5 Axis Trigger Guard 19. Hex Key