Description
The Angstadt Arms, Sharps Bros Jack 9 Stripped Lower is a dedicated 9mm AR platform receiver designed for building a compact, reliable pistol or short-barreled rifle (SBR). This black anodized lower accepts Glock-pattern magazines, providing a robust foundation for a high-capacity, maneuverable build ideal for home defense or competition. It ships to Missouri and compliant US states.
Key Features
- Dedicated 9mm AR-15 Lower: Engineered from the ground up for 9mm, not a converted .223 lower, ensuring superior magazine fit and feed reliability.
- Glock Magazine Compatibility: Uses readily available, proven Glock-style magazines (G17, G19, etc.) for high capacity and easy sourcing.
- Sharps Bros “Jack” Design: Aggressive, skeletonized aesthetic with integrated flared magwell for faster reloads under pressure.
- Stripped Receiver: Provides the core for your custom build, allowing you to select your own trigger, stock, and buffer components.
- Mil-Spec Compatible: Works with standard AR-15 lower parts kits and many aftermarket triggers—no gunsmithing required for assembly.
Specifications & Details
| Specification | Detail |
|---|---|
| Caliber | 9mm |
| Magazine Compatibility | Glock-pattern (Gen 3/4) |
| Material | 7075-T6 Aluminum |
| Finish | Type III Hardcoat Anodized, Black |
| Receiver Type | Stripped Lower |
| Fire Control Group | Accepts mil-spec AR-15 triggers |
Weighing in at a lean profile due to its skeletonized design, this lower is the starting point for a build that won’t weigh you down. The investment of $328.99 gets you a purpose-built foundation that sidesteps the common feeding issues of adapted lowers. It’s built to pair seamlessly with 9mm upper receivers from brands like Angstadt Arms, CMMG, or Foxtrot Mike, creating a system where everything fits out of the box. When it comes to building a truck gun or a home defense tool that needs to work every single time, starting with a dedicated lower isn’t just smart—it’s non-negotiable.
Who This Lower Is For
This is for the builder who values mission-specific tools. It’s for the shooter who wants a compact 9mm AR pistol for vehicle or home defense, where magazine commonality with a sidearm is a strategic advantage. It’s also for the USPSA or PCC competitor looking for a lightweight, reliable platform with a fast magwell. If you’re tired of adapters and want a clean, direct solution for a 9mm build, this lower is your answer.
Pros & Cons
Pros: Unmatched reliability with Glock mags compared to adapter-based systems. The flared magwell provides a tangible speed advantage. The aggressive Sharps Bros styling stands out from generic receivers. Being a dedicated 9mm lower means fewer potential failure points.
Cons: As a stripped receiver, it requires additional parts and assembly. The skeletonized design may allow more debris ingress in extremely dirty environments. You’re locked into the Glock magazine ecosystem—a pro for most, but a con if you have stacks of Colt-style mags.
Frequently Asked Questions
Q: What parts do I need to complete this lower?
A: You will need a standard AR-15 lower parts kit (LPK), a 9mm-specific buffer and buffer spring (heavier than .223), a pistol brace or stock (and appropriate tax stamp for an SBR), and a compatible 9mm upper receiver. The fire control group from a standard LPK fits perfectly.
Q: Does this work with aftermarket triggers like a drop-in cassette?
A: In most cases, yes. The lower is mil-spec dimensionally, so most drop-in triggers designed for the AR-15 platform will function. However, always verify compatibility with the trigger manufacturer for 9mm use, as some may require specific hammers or springs for reliable ignition on harder 9mm primers.
Q: What Glock magazines does it use?
A: It is designed for standard double-stack 9mm Glock magazines like the common 17-round (G17) or 15-round (G19) mags. It also accepts larger 33-round “fun sticks” for maximum capacity. It’s optimized for Gen 3 and 4 magazines, which are the most prevalent.
Look, building a firearm is about confidence in your components. The Angstadt Arms, Sharps Bros Jack 9 Stripped Lower provides that confidence from the ground up. It transforms the versatile AR platform into a potent, close-quarters tool that shares magazines with the most popular handgun on the planet. Available at firearms-missouri.com for Missouri residents and nationwide. Start your build with a foundation that’s built for the task.
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