AR Lower Parts and Kits
Shop AR lower parts and kits, including AR-15 lower parts kits, selectors, pins, springs, grips, trigger guards and other lower receiver components. Choose individual replacement parts or multi-component kits and compare each product's intended platform, included components and specifications.
Read More About Our AR Lower Parts and Kits
AR Lower Parts and Lower Parts Kits
AR lower receivers use numerous individual controls, pins, springs and related components. Ballistic Barn carries individual lower parts as well as lower parts kits that combine multiple components into a single package.
The current selection is especially focused on AR-15 lower parts and AR-15 lower parts kits, with products ranging from individual replacement components to more comprehensive lower build kits.
Individual AR Lower Parts vs. Lower Parts Kits
Individual Lower Parts
Individual lower receiver parts provide a way to select a particular component without purchasing an entire kit. Available products include controls, pins, springs, retainers, grips and other lower receiver components.
AR Lower Parts Kits
Lower parts kits package multiple lower receiver components together. The exact contents vary by product, so compare the included components before choosing a kit for a particular configuration.
AR Lower Receiver Parts
Safety Selectors
Safety selector components are available in different designs, including conventional and ambidextrous configurations. Check the individual product specifications for platform and design details.
Bolt Catches and Controls
Lower receiver controls include components such as bolt catches and related parts. Product designs and compatibility can vary, making the individual specifications important when comparing options.
Takedown and Pivot-Pin Parts
Pins, springs, detents and related replacement components are available individually or as part of larger lower parts kits.
Trigger Guards
Trigger guards are available as individual lower receiver components in different designs and materials. Review each product listing for its stated specifications.
Pistol Grips
Pistol grips are available in different shapes and configurations, including designs with additional storage or other product-specific features.
Springs, Detents and Retainers
Small lower receiver components include springs, detents, retainers and related replacement parts. These may be sold individually, in small replacement sets or as components within larger kits.
AR-15 Lower Parts Kits
AR-15 lower parts kits provide multiple lower receiver components in one package, but not every kit contains the same assortment of parts. Some products focus primarily on traditional lower receiver components, while larger lower build kits may contain additional components.
Because the contents vary, use the individual product listing to determine exactly what is included rather than assuming that every AR-15 lower parts kit contains an identical set of components.
AR Lower Parts Compatibility
Many lower receiver components are platform-specific, and compatibility should be determined from the specifications of the individual product. Parts intended for an AR-15 should not automatically be assumed to fit every AR-10, large-frame or other AR configuration.
Confirm the Intended Platform
Check whether each lower part or kit is identified for an AR-15, AR-10 or another applicable platform. Large-frame AR designs can also vary by manufacturer and receiver pattern, so individual product specifications should take priority over broad platform terminology.
Lower Parts and Buffer System Components
Some lower receiver configurations also require separate buffer-system components such as a receiver extension, buffer and spring. These components are not necessarily included with a lower parts kit.
Browse our AR Buffer Tube Parts and Kits for additional buffer-system components, or return to AR Parts to browse the broader parts catalog.
AR Lower Parts and Kits FAQs
What is an AR lower parts kit?
An AR lower parts kit is a packaged collection of multiple lower receiver components. The exact components included vary by product, so review the individual kit listing for its contents.
Are all AR-15 lower parts kits the same?
No. Lower parts kits can differ in the components they include, component designs and other specifications. Compare the contents of each kit before making a selection.
Can I buy individual AR lower parts instead of a complete kit?
Yes. This category includes individual lower receiver components as well as kits containing multiple parts.
Are AR-15 and AR-10 lower parts interchangeable?
Some components may share specifications, while others differ by platform or receiver pattern. Check the compatibility information for the individual product rather than assuming AR-15 and AR-10 lower parts are interchangeable.
Does a lower parts kit include buffer tube parts?
It depends on the product. Kit contents vary, and buffer-system components may be sold separately. Review the individual product listing to see exactly which components are included.