Polymer80 G150 AR15 80% Lower Receiver Only

The Polymer80 G150 AR15 80% Lower Receiver Only is a semi-finished component designed for the custom builder who demands precision and material integrity without the burden of serialized registration. Constructed from reinforced polymer with a proprietary blend that resists impact and thermal fatigue, this lower receiver serves as the foundational chassis for your AR15 platform. As an 80% receiver, it requires end-user machining to complete the fire control group pocket and trigger pin holes, granting the builder full control over the final tolerances and finish. This part is sold as a non-firearm component and ships directly to your door without an FFL transfer, though final assembly and compliance with all local, state, and federal laws remain your responsibility.

Overview

The Polymer80 G150 AR15 80% Lower Receiver Only represents a significant departure from traditional aluminum forgings. Using a high-modulus glass-filled polymer formulation, the G150 achieves a weight savings of approximately 40% over standard mil-spec lowers while maintaining dimensional stability under sustained recoil. The receiver is engineered with reinforced buffer tower walls and a steel-reinforced trigger pin insert area to prevent elongation over the receiver’s service life. This particular model is compatible with mil-spec AR15 upper receivers, buffer tubes, and stock assemblies, making it a versatile building block for lightweight carbines, pistol-caliber ARs, or custom precision builds. The 80% completion stage means the fire control pocket is pre-formed to near-final dimensions, requiring only a drill press or router jig to finish the trigger and hammer pin holes.

Features & Specs

• Material: Proprietary high-impact glass-reinforced Nylon 6/6 polymer with UV stabilizers, tested to MIL-STD-810G for temperature extremes from -40F to 160F.
• Compatibility: Accepts all standard AR15 lower parts kits, mil-spec trigger groups, and pistol grips. Integrated trigger guard is machined as a single unit with the receiver body.
• Machining requirement: 80% completion level. Requires drilling of two 0.154-inch trigger pin holes and one 0.250-inch hammer pin hole. Pocket is pre-machined to within 0.020 inches of final depth.

• Weight: 6.8 ounces (empty receiver only), with a steel trigger pin reinforcement plate weighing 0.4 ounces pre-installed.
• Finish: Textured matte black with an anti-glare surface treatment that resists solvents and oils. No additional coating or anodizing required for corrosion resistance.
• Hardware: Includes the steel trigger pin reinforcement bushing and a 4-40 set screw for takedown pin tension adjustment. All other pins and springs must be sourced separately.

• Dimensional accuracy: Critical interface surfaces are held to a tolerance of +/- 0.005 inches. The buffer tube threading is 1.25-inch x 18 TPI, per mil-spec.
• Safety: The receiver includes a factory-installed integrated trigger guard and a reinforced magazine catch pocket. The selector detent hole is pre-drilled and countersunk.
• Testing: Each receiver is individually inspected for flash, sink marks, and warpage. Rejection rate for dimensional non-conformance is less than 0.5%.

Who It’s For

This product is intended for experienced firearms builders who possess the necessary tooling and technical knowledge to complete a non-serialized receiver. The Polymer80 G150 AR15 80% Lower Receiver Only is suited for hobbyists constructing a lightweight field rifle, a competition-ready carbine, or a dedicated pistol-caliber build where polymer’s reduced weight provides a tangible handling advantage. It also appeals to builders who wish to avoid the paperwork and transfer fees associated with serialized receivers, though you must verify that your local jurisdiction permits the possession and completion of unserialized lowers. This is not a drop-in component; you will need a drill press or router jig, drill bits, and a deburring tool to finish the fire control pocket. If you are a first-time builder, we recommend watching our instructional video or consulting a qualified gunsmith before beginning work.

Shipping & FFL

Because the Polymer80 G150 AR15 80% Lower Receiver Only is classified by the ATF as an unfinished, non-firearm component (80% receiver), it does not require transfer through a Federal Firearms License (FFL) dealer. It ships directly to your residential or business address with no transfer fee, no background check, and no waiting period. However, once you complete the machining process, the finished receiver becomes a firearm under federal law and must be treated as such. You are solely responsible for ensuring compliance with all applicable local, state, and federal laws regarding the possession, completion, and use of unserialized firearm components. No returns are accepted on machined or modified receivers. Standard shipping methods apply; signature may be required at the carrier’s discretion. Sales to minors, residents of states with outright bans on unserialized receivers, or persons prohibited from possessing firearms are strictly forbidden and will result in order cancellation.