In a lower parts kit, you will find all of the small moving parts that make up the lower receiver of an AR-15 rifle. This includes the trigger, trigger guard,
disconnector, hammer, takedown pins, buffer tube detent, and more. These are all high-quality 100% Mil-Spec parts that are perfect for replacement or building a new AR-15 from scratch. Many shooters like to have a spare lower parts kit on hand in case something breaks or wears out on their rifles.
Stephen Answered question August 28, 2022