Billet AR-9 Rifle Lower Receiver

This Billet AR-9 Rifle Lower Receiver is the dedicated, high-quality foundation for building a reliable 9mm pistol-caliber carbine (PCC). Engineered from the ground up for the AR-9 platform, it eliminates the need for adapters or compromises associated with modified AR-15 lowers. If you’re building a 9mm range toy, competition gun, or a compact truck gun, this billet lower from Miami Shooters Supply provides superior strength and direct compatibility. You get a purpose-built receiver with fast shipping, ready to become the core of your next project.

Key Features

• Machined from a solid 7075-T6 aluminum billet for exceptional durability and a premium finish.
• Designed specifically for 9mm Glock-style magazines, ensuring reliable feeding and a clean, integrated look.
• Features a dedicated, reinforced feed ramp and magwell geometry optimized for the 9mm cartridge.
• Includes a threaded bolt catch pin and integrated trigger guard for a clean, snag-free profile.
• Hard-coat anodized finish provides a wear-resistant surface that stands up to heavy use.
• Compatible with most standard AR-15 lower parts kits, grips, and triggers for easy assembly.

Built For

This receiver is ideal for the builder who demands a correct, no-compromise start to their 9mm PCC. It’s perfect for USPSA or IDPA PCC competitors needing a robust and reliable platform, as well as for enthusiasts building a fun, low-recoil range firearm or a compact home defense option. It’s made for those who appreciate the solid feel and precise machining of a true billet part in their AR-15 parts collection.

Specifications

• Caliber: 9mm (Designed for Glock-pattern magazines)
• Material: 7075-T6 Aluminum Billet
• Finish: Type III Hardcoat Anodized (Black)
• Compatibility: Uses most standard AR-15 lower parts kits (LPK) and pistol braces/rifle stocks.
• Fire Control: Semi-Automatic (SA) only.

FAQ

Does this Billet AR-9 Lower Receiver require a special buffer or upper?
Yes. You will need a 9mm-specific buffer (heavier weight) and a dedicated AR-9 upper receiver or a standard upper with a 9mm bolt carrier group for proper function. Always consult your parts manufacturer for compatibility.

Is this lower compatible with Colt-style or other 9mm magazines?
No, this particular Billet AR-9 Rifle Lower Receiver is configured specifically for Glock-style 9mm magazines. It will not accept Colt-style or other magazine patterns without modification.