DoubleStar Lower Parts Kit M-16 Black. Includes all internals to complete an M16 lower receiver. Specifications for DoubleStar Lower Parts Kit M-16: Manufacturer: DoubleStar Color: Black Fabric/Material: Steel/ Brass/ Aluminum Gun Make: AR Platform Gun Model: M16 Weight: 15 oz Condition: New Features of Doublestar Lower Parts Kit M-16 M16 Lower Parts Kit All parts needed complet an M16 Lower Receiver Coiled steel spring pins additional takedown detent and spring Package Contents: Doublestar Lower Parts Kit M-16 DoubleStar AR320: Lower Parts Kit M-16 Black