A Parts Kit is the backbone of any firearm assembly, offering a comprehensive collection of essential components required to build or maintain AR-15 and AR-10 rifles. These kits encompass upper and lower parts, ensuring you have everything needed for your firearm project. From pins and springs to grips and triggers, Parts Kits guarantee reliability and performance, making them indispensable in the firearms industry. Elevate your firearm project with these high-quality components and unlock the potential for customizations and upgrades.