Description

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

This AR9 80% lower receiver is precision machined from 6061-T6 billet aluminum and laser engraved with clear fire/safe markings. Designed specifically for 9mm Glock-pattern builds, this un-machined lower provides the foundation for a custom pistol caliber carbine (PCC) platform. The raw billet construction and unfinished trigger pocket allow the builder to complete the lower to their preferred specifications, with no serial number or FFL transfer required at the point of sale. The AR9 80% lower fire/safe marked – 9mm – billet features a multi-caliber cut that accommodates both straight-blowback and some radial-delayed 9mm upper receivers.

Overview

The AR9 80% lower fire/safe marked – 9mm – billet is manufactured from a solid billet of 6061-T6 aluminum, heat treated to T6 condition for structural integrity. The lower is machined to 80% completion, meaning the trigger pocket, hammer pin holes, and fire control group recess are un-machined, requiring the end user to complete these operations. The lower is marked with standard AR-style fire/safe selector positions, laser engraved for durability. This billet receiver is compatible with standard AR15 buffer tubes, pistol braces, and AR9-specific magazines (Glock pattern). The tang is reinforced for additional strength at the buffer tube interface, and the magazine well is beveled for smooth reloads.

Features & Specs

• Material: 6061-T6 billet aluminum, hard coat anodized black finish for corrosion resistance and wear protection
• Markings: Laser engraved “FIRE” and “SAFE” markings on both sides of the lower, with a clearly defined selector detent channel
• Compatibility: Accepts standard AR15 LPK components (except hammer and trigger pins, which require finishing), Glock-pattern 9mm magazines, and mil-spec buffer tubes
• Specifications: Overall length 7.5 inches, weight approximately 9.2 ounces, magazine well width 1.075 inches (Glock 19/17 compatible)
• Hardware: Includes a single bolt catch pin and spring; all other components must be supplied by the builder

Who It’s For

This AR9 80% lower fire/safe marked – 9mm – billet is intended for the experienced hobbyist or gunsmith who wants to complete a 9mm pistol caliber carbine from a bare receiver. It is suited for builders who already possess the necessary tooling (drill press, end mills, jig) to finish the trigger pocket and pin holes. The lower is not recommended for first-time 80% builders unless they have experience with aluminum machining and AR15 fire control group geometry. It is designed for those who prefer a billet receiver over a forged unit, offering sharper edges and a more uniform wall thickness. This lower is ideal for someone building a dedicated 9mm SBR, pistol, or carbine that uses Glock magazines and wants the clarity of marked fire/safe positions without the cost of a fully finished receiver.

Shipping & FFL

This product is an 80% lower receiver and is not considered a firearm by the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) as it is not yet in a functional state. It can be shipped directly to your residence or business without requiring transfer through a Federal Firearms License (FFL) holder. No background check is required for purchase. However, once you complete the machining process, you are responsible for complying with all applicable local, state, and federal laws regarding the manufacture and possession of a firearm. Some states and municipalities may restrict or prohibit the purchase or possession of 80% receivers. It is your responsibility to verify the laws in your jurisdiction before ordering. We ship via UPS Ground or USPS Priority Mail to all 50 states, except where prohibited by law. No signature is required for standard delivery.