You already have a Hi-Capa Gas Blowback pistol but want the John Wick Sand Viper GBB Pistol? You can have the best of both worlds with the GSB Hi-Capa Sand Viper Open Slide Set as shown by Angry Bull... "Unboxing the newest part for the next build! Let's have a look at the Sand Viper Kit fro GSB. I'm already gatherng other parts for this and I can't wait to get it put together for you."