TAPCO BUFFER TUBE KIT. This kit includes everything needed for a complete buffer tube assembly including a 6-position buffer tube carbine buffer buffer spring castle nut and TAPCO Endplate/Sling adapter. Crafted with precision and durability in mind each component is engineered to Mil-Spec standards for reliable performance in any situation. The 6-position buffer tube allows for adjustable length-of-pull while the carbine buffer and buffer spring ensure smooth and consistent cycling. The castle nut ensures secure installation while the TAPCO Endplate/Sling adapter adds sling attachment options for added convenience. Specifications for Tapco TAP22058 Buffer Tube Kit Black AR Platform: Manufacturer: Tapco Color: Black Gun Make: AR Platform Gun Model: AR-15 Buffer Tube Length: Carbine Length Buffer Tube Size: Mil-Spec Gun Type: Rifle Tapco TAP22058 Buffer Tube Kit Black AR Platform What firearm models does the manufacturer say Tapco TAP22058 Buffer Tube Kit Black AR Platform is compatible with? The manufacturer says that Tapco TAP22058 Buffer Tube Kit Black AR Platform is compatible with AR-15