The Gorilla Machining Nickel Boron AR-10 lower parts kit is a one stop purchase to get everything you need to complete your first or tenth lower receiver. This AR-15 LPK is made up of Mil-Spec components for maximum compatibility with all lower receivers. It not only comes with the small springs, detents, and pins, but also a Mil-Spec trigger group, A2 pistol grip, and a billet machined trigger guard. The trigger guard is enlarged to give you enough room to pull the trigger if you are wearing gloves. This Mil-Spec complete lower parts kit by GM is an affordable way to complete your build.