Polymer80 G150 AR15 80% Lower Receiver Only

The Polymer80 G150 AR15 80% Lower Receiver Only represents a precision-engineered foundation for the custom AR-15 builder who demands structural integrity without the serialized regulatory pathway. This component is manufactured to the exacting tolerances expected from Polymer80, a recognized leader in the 80% receiver market. Designed as an unfinished lower receiver, it requires final machining of the fire control pocket and trigger pin holes to complete the receiver into a functional firearm component. The G150 platform utilizes a reinforced polymer construction that balances weight reduction with the mechanical strength required for repeated cycling of standard AR-15 upper receiver assemblies.

Overview

The Polymer80 G150 AR15 80% Lower Receiver Only is a non-serialized, unfinished lower receiver intended for personal fabrication. This receiver is compatible with mil-spec AR-15 upper receivers, buffer tubes, and lower parts kits. The 80% completion state means the fire control cavity, hammer and trigger pin holes, and selector detent channels are not fully machined, requiring the builder to complete these operations using standard jigs and tooling. The G150 design incorporates an integrated trigger guard and a flared magazine well for improved reload ergonomics. Polymer80 utilizes a proprietary high-impact polymer blend that resists impact deformation and environmental stress cracking.

Features & Specs

• Material: Proprietary reinforced polymer composite with glass-fiber fill for enhanced tensile strength and dimensional stability under thermal cycling.
• Design: Integrated trigger guard eliminates separate installation; flared magazine well provides 0.125-inch additional clearance for rapid magazine insertion.
• Compatibility: Accepts all standard AR-15 lower parts kits, buffer tube assemblies, and mil-spec upper receivers without additional fitting or modification to the receiver interface surfaces.
• Weight: Approximately 8.2 ounces, reducing overall rifle weight by approximately 30% compared to standard aluminum 7075-T6 lower receivers.
• Finish: Textured grip surface with molded-in stippling pattern; black matte finish reduces glare and provides consistent paint adhesion for custom cerakote applications.
• Machining Requirement: Requires drilling of two trigger pin holes (0.154-inch diameter), one hammer pin hole (0.154-inch diameter), and milling of the fire control pocket to standard depth specifications.

Who It’s For

The Polymer80 G150 AR15 80% Lower Receiver Only is intended for experienced firearm builders who possess the tooling and technical knowledge to complete an 80% receiver to functional specification. This product is appropriate for the hobbyist who maintains their own machining equipment and understands the mechanical relationship between trigger geometry, sear engagement, and hammer fall timing. It is also suited for the precision builder who wishes to fabricate a receiver with specific trigger component clearances not achievable with mass-produced, serialized receivers. This receiver is not for the first-time builder unless they have access to a qualified mentor or instructional workshop environment where proper jig alignment and drilling techniques can be demonstrated.

• Requires completion using a dedicated Polymer80 G150 jig and standard drill press or handheld drill with depth stop.
• Recommended for builders who have completed at least one previous 80% receiver project successfully.
• Not suitable for builders seeking a drop-in, ready-to-assemble lower receiver without fabrication work.

Shipping & FFL

This Polymer80 G150 AR15 80% Lower Receiver Only is classified as a non-firearm item under current Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) regulations because it is not yet a completed receiver frame. As such, it does not require transfer through a Federal Firearms License (FFL) dealer for shipment. This item may be shipped directly to your residential or business address via standard carriers. No age verification beyond standard e-commerce checkout confirmation is required by federal law, though we reserve the right to verify age of majority for all firearms-related component purchases. Please consult your state and local laws regarding the legality of 80% receiver possession and completion, as some jurisdictions impose additional restrictions or outright prohibitions. By purchasing this item, you acknowledge that you are legally permitted to possess and complete an unfinished receiver in your jurisdiction.

• Shipped directly to your address; no FFL transfer fee required.
• Standard domestic shipping included; expedited options available at checkout.
• Customer is solely responsible for compliance with all applicable federal, state, and local laws regarding 80% receiver ownership and completion.