Kit includes recoil buffer components for a new .223 AR15 Carbine build or to convert your current AR15 to use a Mil-Spec carbine buffer tube recoil system. – Kit includes: – Mil-Spec 6-Position/Carbine Tube – Material: 6061-T6 Aluminum – Finish: Hardcoat Anodized Black – .223 buffer spring – .223 buffer body – Latch Plate – Lock Ring