The Pit Stock 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. Despite the additional strength, the minimalist design weighs only 4 oz. 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. The orbital stock shape, introduced with the PDW stock, 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.