The Vltor Carbine Spring and Buffer are perfect replacement or upgrade parts for your carbine rifle build. 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