Known for making some of the most popular aftermarket AR-15 triggers sold today, Geissele expanded its offerings to include other components of the AR-15, allowing AR builders to finish a complete lower receiver with the parts available from the company. The Geissele Super Duty Lower Parts Kit provides all of the internals you need to finish a standard AR-15 lower receiver, minus the trigger group, which you can order separately. Each Geissele Super Duty Lower Parts Kit include proprietary components that are machined from stainless steel at the company's facility in North Wales, PA. The stainless-steel construction ensures that the internals of your AR-15 are less-susceptible to corrosion or failure throughout the lifetime of your rifle, even in extreme-use conditions. In addition to many standard components, the Geissele Super Duty Lower Parts Kit also includes a few enhanced components, like the company's Maritime Bolt Catch, Ambidextrous Posi-Lock Safety and the company's Super Duty Trigger Guard. Each of these components are constructed with an eye toward improving the usability of the AR platform by allowing for more tactile engagement and easier access to critical control components.