Quick Look

The AR-15 lower receiver originated in the 1960s as the core component of the AR-15 rifle. Designed for modularity and customization, it offers versatility for various builds. Today, AR-15 lowers remain highly popular among firearms enthusiasts and builders.

Why It's a Top Choice

• Highly customizable for diverse shooting needs
• Durable materials for lasting reliability
• Wide aftermarket support and compatible parts
• Simple design facilitates easy assembly
• Legal compliance varies by state and model

Key Variants

Stripped AR-15 Lower Receiver

Ideal for builders wanting full customization with no pre-assembled parts.

Complete AR-15 Lower Receiver

For users desiring a ready-to-install lower with fire control group installed.

Polymer AR-15 Lower Receiver

Lightweight and corrosion-resistant option suited for budget builds.

Competitor Comparison Table

Best Use Cases

• Custom rifle building and upgrades
• Home defense and tactical setups
• Competition shooting platforms
• Training and marksmanship practice
• Collecting modular firearm parts

FAQs

Can I build an AR-15 from just a lower receiver?

Yes, the lower receiver is the serialized firearm part. Additional upper components are required to complete the build legally.

What materials are AR-15 lowers commonly made of?

Most lowers use forged or billet aluminum, some polymer lowers are also available for lighter weight.

How does the AR-15 lower affect rifle customization?

The lower defines compatibility for trigger groups, stocks, and magazine sizes, allowing extensive customization.