AR9 80% Lower Fire/Safe Marked – 9mm – Billet

This billet AR9 80% lower receiver is precision-machined from 7075-T6 aluminum and features clearly engraved fire/safe markings. Designed for builders who demand exacting tolerances in a 9mm platform, this component requires final machining to complete the fire control pocket. The raw billet construction provides a clean, rigid foundation for your PCC build without the forging lines found on standard lowers.

Engineered specifically for 9mm Glock-style magazine compatibility, this ar9 80% lower fire/safe marked – 9mm – billet unit accepts standard AR9 upper receivers and LPK components. The extended trigger guard accommodates gloved hands, while the flared magazine well facilitates rapid reloads. Each lower is individually serialized on the raw forging for traceability before completion.

Overview

This AR9 80% lower receiver starts as a solid 7075-T6 aluminum billet, machined to 95% completion. The fire control pocket, trigger slot, and safety selector detent channels are cut to blueprint specifications, leaving only the final pocket depth and selector holes for the builder to complete. The lower is marked with both “FIRE” and “SAFE” positions using laser-etched white lettering that remains legible through multiple finishes. The 9mm bolt catch cutout is properly profiled for Glock-pattern magazines, ensuring reliable last-round hold-open function after completion.

• Precision CNC-machined from 7075-T6 billet aluminum with hardcoat anodized finish
• Laser-etched fire/safe selector markings with white fill for high visibility
• Extended magazine release paddle cutout and flared magwell for 9mm Glock-pattern magazines

Features & Specs

Manufactured by AR9 in their US-based facility, this billet lower is classified as a Parts category component. The pocket geometry matches standard AR9 jig specifications, allowing compatibility with common 80% jig systems. Threaded bolt catch pin holes accept standard roll pins, while the rear takedown pin lug is reinforced for 9mm blowback bolt carrier group wear. The trigger pocket measures 1.250 inches deep as-machined, requiring final pocket depth of 1.150 inches for standard triggers.

• 7075-T6 aluminum billet construction with Type III Class 2 hardcoat anodizing
• 0.250-inch thick trigger guard wall for durability under recoil impulse
• Accepts standard AR15 LPK with 9mm-specific buffer weight recommendations

Who It's For

This ar9 80% lower fire/safe marked – 9mm – billet is intended for experienced firearm builders who possess the necessary tooling and knowledge to complete an 80% receiver. The component suits competition shooters building a 9mm PCC for USPSA or steel challenge matches, as well as hobbyists constructing a dedicated pistol-caliber carbine for range use. Builders should have experience with AR15 trigger pocket finishing and selector hole drilling before purchasing this component. The billet construction provides additional material for builders who wish to custom-fit trigger components or modify the rear lug for specific upper receiver tolerances.

• Designed for builders with access to a drill press, router jig, and end mills
• Suitable for 9mm PCC builds using Glock-pattern magazines only
• Requires final trigger pocket depth, selector hole drilling, and rear takedown pin hole finishing

Shipping & FFL

This product is an 80% lower receiver and is not classified as a firearm by the ATF. It may be shipped directly to your residence or business without an FFL transfer. No background check is required for purchase. However, once completed, the finished receiver must comply with all applicable federal, state, and local laws regarding firearm manufacture and ownership. Some states restrict or prohibit 80% receivers or self-manufactured firearms. It is your responsibility to verify legality in your jurisdiction before purchasing this ar9 80% lower fire/safe marked – 9mm – billet. We recommend consulting with a firearms attorney if you have questions about local requirements. This product ships via UPS Ground or FedEx Ground with signature confirmation. International shipping is not available. Returns are accepted within 30 days for unmodified, original-condition product only. FFL transfers are not required for this item.