Vltor Carbine Spring and Buffer Kit. These AR15 Buffer Assemblies are uniquely manufactured to provide repeatable accuracy and reliability throughout the system of your firearm. Featuring a standard 3oz carbine buffer this Vltor SP-1 Standard Carbine Buffer and Spring Kit will not work on the VLTOR A5 buffer system. Don't settle for less make sure your carbine rifle is equipped with the best - pick up a Vltor Carbine Rifle Spring and Buffer Kit Specifications for Vltor SP-1 Carbine Spring and Buffer Kit: Manufacturer: VLTOR Gun Model: AR-15 Additional Features: Carbine Condition: New Features of Vltor SP-1 Carbine Spring and Buffer Kit: Standard carbine buffer Carbine length action spring VLTOR endplate Receiver locknut Package Contents: Vltor SP-1 Carbine Spring and Buffer Kit What firearm models does the manufacturer say Vltor SP-1 Carbine Spring and Buffer Kit is compatible with? The manufacturer suggests that Vltor SP-1 Carbine Spring and Buffer Kit is compatible with AR-15