Strike's Pit Viper is designed to work in concert with the Advanced Receiver extension. By interfacing with the keyed receiver extension, the additional points of contact results in a fitted feel and rattle free, rock solid lock up. The stock can be adjusted out to three positions to create a more custom fit for the shooter. Ambidextrous QD swivels are built in for a strong, integrated solution. Its orbital stock shape, creates an ergonomic, secure shoulder weld, even in the unorthodox shooting positions characteristic of vehicle born, or extreme close quarters conditions the form factor is designed to dominate. This model has a red finish.