Polymer80 AR15 80% Receiver w/ Jig Kit

Product Overview

The Polymer80 AR15 80% Receiver w/ Jig Kit represents a foundational component for the dedicated firearms enthusiast seeking a personalized build experience. This product is an 80% lower receiver, meaning it is not classified as a firearm upon purchase and requires machining to completion by the end-user. Crafted from a durable polymer frame material, it is designed for builders who value a lightweight option and the satisfaction of creating a custom AR-15 platform rifle. The included jig kit provides the necessary guidance for the machining process. Ideal for hobbyists, custom rifle builders, and those interested in the mechanics of the semi-automatic platform, this kit serves as the starting point for a unique and tailored firearm build, compatible with a vast array of standard AR-15 components.

Key Features

• Durable Polymer Construction: The receiver is molded from high-strength polymer, offering a significant weight reduction compared to traditional aluminum lowers while maintaining structural integrity for standard use.
• Complete Jig Kit Included: The provided precision jig is essential for safely and accurately completing the receiver’s fire control cavity, guiding drill bits and milling tools to create a functional lower.
• Full Mil-Spec Compatibility: Engineered to work seamlessly with standard mil-spec AR-15 lower parts kits (LPK), buffer tube assemblies, and any standard forged or billet upper receiver, ensuring maximum parts interchangeability.
• Simplified Design for Accessibility: As a more accessible version of Polymer80’s advanced models, this lower offers a straightforward platform, making it a suitable project for builders with fundamental machining skills.
• Semi-Automatic Action Platform: When completed and assembled with a proper upper receiver and parts kit, it functions as a standard semi-automatic rifle, adhering to the ubiquitous AR-15 operating system.
• Build Flexibility: Serves as the legal and mechanical foundation for constructing a custom rifle tailored to specific preferences for caliber, barrel length, handguard, stock, and trigger system.

Performance & Applications

The primary application of the Polymer80 AR-15 80% Receiver is to serve as the core of a custom-built rifle. Its performance is directly tied to the quality of the completion work and the components selected by the builder.

Custom Lightweight Builds: The polymer frame material makes this receiver an excellent choice for builders aiming to minimize overall rifle weight. When paired with a lightweight upper receiver, handguard, and stock system, it can form the basis of a highly portable rifle suited for extended carry in field applications or competitive shooting where weight is a critical factor.

Educational & Hobbyist Projects: For individuals deeply interested in the function and assembly of the AR-15 platform, completing this receiver provides invaluable hands-on understanding. The process demystifies the role of the lower receiver, the fire control group, and how all components interface to create a functioning firearm. It is a project centered on skill development and mechanical comprehension.

Specialized Range or Training Rifle: Once completed, the receiver can be built into a dedicated .22LR caliber trainer using a conversion upper or a specific caliber like 9mm with a compatible magazine block. This allows for the creation of an affordable-to-shoot, dedicated platform for high-volume training, plinking, or introductory use, leveraging the familiar AR-15 ergonomics and controls.

About Polymer80

Polymer80 is a recognized leader in the manufacturing of advanced polymer frames and receivers for the firearms community. The company has established its authority through a dedicated focus on engineering, material science, and precision tooling. Their expertise is evident in the design of jigs and fixtures that enable precise manufacturing by end-users, a niche that demands a deep understanding of both machining tolerances and firearm function. Polymer80’s products are developed with a clear intent: to provide enthusiasts with a reliable platform for legal, custom firearm construction. Their commitment to compatibility with mil-spec parts underscores a design philosophy rooted in functionality and adherence to established engineering standards within the industry. This focus on quality control, material integrity, and user-enabled manufacturing has solidified their position as a trusted brand among experienced builders.

Make Your Decision

The Polymer80 AR15 80% Receiver w/ Jig Kit is a purposeful tool for a specific audience. It is not a finished product but the beginning of a build project that requires additional tools, components, and a commitment to learning proper machining techniques. If your goal is to understand the AR-15 platform intimately, to create a uniquely configured rifle, or to utilize a lightweight polymer lower in your build, this kit provides a proven and compatible foundation. Ensure you are prepared for the responsibility of completing it correctly and safely, in full compliance with all applicable federal, state, and local laws. For the informed builder, this represents the first step in a rewarding process of creation and customization.

Technical Specifications

Manufacturer	Polymer80
Action Type	semi-automatic
Frame Material	polymer

Frequently Asked Questions