The New Frontier Armory C-9 Billet Lower Receiver is a proven foundation for building a reliable AR9. Precision machined from billet aluminum and finished with a durable Type III hard coat anodizing, the C-9 combines premium fit and finish with excellent compatibility for builders who want to use common AR15 components.
Designed to accept Glock-pattern 9mm magazines, the C-9 works with standard mil-spec AR15 lower parts kits, AR15 grips, triggers, and mil-spec receiver extensions (buffer tubes), making it easy to customize your build without relying on proprietary components.
Whether you’re assembling a compact range gun, competition PCC, suppressor host, or home defense firearm, the C-9 provides a solid, American-made starting point.
Features
- Billet aluminum AR9 stripped lower receiver
- Compatible with Glock-pattern 9mm magazines
- Precision CNC machined billet construction
- Accepts standard mil-spec AR15 lower parts kits
- Compatible with mil-spec AR15 buffer tubes
- Standard AR15 trigger compatibility
- Standard AR15 grip compatibility
- Compatible with dedicated AR9 upper receivers
- Type III hard coat anodized finish
- Made in the USA
Specifications
Manufacturer: New Frontier Armory
Model: C-9
Platform: AR9 / PCC
Magazine Compatibility:
- Glock-pattern 9mm magazines
Lower Parts Compatibility:
- Standard Mil-Spec AR15 Lower Parts Kit
Trigger Compatibility:
- Standard AR15 Triggers
Receiver Extension Compatibility:
- Mil-Spec AR15 Buffer Tube
Construction:
- Billet Aluminum
Finish:
- Type III Hard Coat Anodized Black
Country of Manufacture:
- USA
Built Around Standard AR15 Components
One of the biggest advantages of the C-9 is its compatibility with standard AR15 components. Builders can use many of the same parts found in a traditional AR15, including:
- Mil-spec lower parts kits
- AR15 triggers
- AR15 grips
- Mil-spec receiver extensions (buffer tubes)
- Standard AR controls
- 9mm Ar15 Barrels
- 9mm Ar15 Upper Receivers
This broad compatibility makes replacement parts easy to source while giving you nearly unlimited customization options.
Glock Magazine Compatibility
The C-9 is built around Glock-pattern 9mm magazines, one of the most popular magazine systems available for AR9 platforms. Factory Glock magazines and many quality aftermarket options are widely available in a variety of capacities, making this an economical and dependable choice for recreational shooting, training, and competition.
Understanding Bolt Hold Open Compatibility
Unlike some dedicated AR9 lowers that house the Last Round Bolt Hold Open (LRBHO) mechanism inside the lower receiver, the New Frontier Armory C-9 is designed to work with compatible upper receiver systems that provide this functionality. This design keeps the lower simple while allowing builders to choose the upper receiver that best fits their project.
Why Buy from Mid State Firearms?
At Mid State Firearms, we work with AR-platform components every day. Whether you’re building your first AR9 or upgrading an existing pistol caliber carbine, we can help you choose compatible components that work together reliably.
We also carry AR9 complete uppers, lower parts kits, buffer assemblies, and other accessories to help you complete your build.
Frequently Asked Questions
Does this lower accept Glock magazines?
Yes. The New Frontier Armory C-9 is designed for Glock-pattern 9mm magazines.
Does this use standard AR15 lower parts?
Yes. The C-9 accepts standard mil-spec AR15 lower parts kits, triggers, grips, and controls.
Does this lower have an integrated Last Round Bolt Hold Open?
No. The C-9 lower itself does not contain an integrated LRBHO mechanism. New Frontier’s LRBHO functionality is designed around compatible upper receiver systems.
Is this a stripped lower?
Yes. This receiver requires a lower parts kit, buffer system, stock or brace (where applicable), and other components to complete the build.
Note: Send us a copy of your FFL or have your FFL dealer email us a copy to FFL@midstatefirearms.com
sound of freedom – This was a great set up. I loved being able to customize the set up. Only issue I had was my own fault as a newb to building these. I used a heavy barrel in a slim hand guard. It makes adding attachments tough with clearances. Hoping someday to also get an AR10 from here.