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NEW!|#637e31
A9X Ambidextrous AR-9 Stripped Lower – Colt® Magazine Pattern
$254.99$229.99 -
NEW!|#637e31
A9X Ambidextrous AR-9 80% Lower – Colt® Magazine Pattern - RAW
$154.99$129.99 -
NEW!|#637e31
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Add to Cart The item has been addedMaglula Magazine Loader/Unloader 9MM Fits Colt SMG
$31.95$28.75
Colt® Pattern Lowers
Colt Pattern vs. Glock Pattern — Why It Matters
Not all AR-9 magazine platforms are created equal.
Glock® Pattern
- ✘ Designed for pistol-length actions
- ✘ Single-column feed geometry
- ✘ Rounds can unseat under blowback recoil
- ✘ Widespread but built for a different job
Colt® SMG Pattern (A9X)
- ✔ Purpose-built for submachine guns
- ✔ Double-stack, double-feed design
- ✔ Straight magazine profile — cleaner lines, lower snag
- ✔ Seats naturally, indexes faster on reloads
Engineered for Builders
Every A9X is 5-axis CNC machined from solid 6061-T6 billet aluminum in Fort Worth, Texas. Billet starts as a single solid block — tighter grain structure, zero porosity, and tolerances that castings and forgings can’t match.
Fully Ambidextrous
Bolt Release
Last-Round
Bolt Hold Open
Flared & Curved
Magwell
Threaded Bolt Catch
No Roll Pins
Why Build an AR-9 in 2026?
The direct-blowback AR-9 is the only 9mm PCC you can build from scratch at home.
The $200 SBR tax stamp was eliminated in January 2026, making short-barrel 9mm builds more accessible than ever. The ATF Form 1 process still exists, but the fee is now $0.
Roller-delayed and gas-delayed PCCs start at $1,200+ as factory-complete guns. You can’t build them at home. You can’t choose your own barrel, handguard, or trigger. The AR-9 lets you do all of that.
The A9X accepts any mil-spec AR-15 fire control group — single-stage, two-stage, drop-in cassette. No proprietary parts, no vendor lock-in.
Standard AR-15 milling dimensions mean it’s compatible with jigs you may already own. One lower, infinite build possibilities. Simpler action, fewer parts, decades of proven reliability.
Building a Colt-Pattern PCC?
Don’t forget magazines, a lower parts kit, and a buffer tube. Everything ships direct.
Common Questions
Everything you need to know before starting your Colt-pattern AR-9 build.
What’s the difference between an 80% lower and a stripped lower?
An 80% lower requires machining at home with a jig before it can accept parts — it ships directly to your door with no FFL needed. A stripped lower is 100% complete and serialized, so it’s legally a firearm and requires an FFL transfer. Choose 80% to build from scratch with no paperwork; choose stripped to skip the milling.
Do I need an FFL to buy an 80% lower?
No. 80% lowers are not classified as firearms and ship directly to your home — no background check, no FFL transfer, no waiting period. The stripped lower does require FFL transfer. Check your state and local laws before purchasing.
What magazines does the A9X use?
Colt-pattern SMG 9mm magazines — a double-stack, double-feed design originally developed for the Colt SMG platform. We carry Duramag Colt SMG mags in 10, 20, and 32-round capacities right here on this page. Brownells 32-round Colt-style magazines are also compatible.
What’s the $0 SBR tax stamp about?
As of January 2026, the federal tax on SBRs and suppressors dropped from $200 to $0. You still submit ATF Form 1 paperwork, but there’s no fee. If you’re building a pistol configuration with a brace, no NFA registration is required at all.
Can I use any AR-15 trigger?
Yes. The A9X accepts standard mil-spec AR-15 fire control groups — single-stage, two-stage, and drop-in cassette triggers all work. No proprietary trigger required.
When will pre-orders ship?
Pre-orders ship in order received once the first production batch is complete (estimated spring 2026). Pre-ordering reserves your unit from the first batch — once that allocation is filled, orders move to the next production window.
Who is prohibited from building a firearm?
Under the Gun Control Act (GCA), it is unlawful for prohibited persons to possess, receive, or build any firearm. This includes convicted felons, fugitives from justice, unlawful users of controlled substances, persons adjudicated as mentally defective, individuals under certain restraining orders, and those convicted of misdemeanor domestic violence, among others. Building a firearm at home is only legal for non-prohibited persons. This applies to both 80% lowers and stripped lowers. Review the full list of prohibited categories under 18 U.S.C. § 922(g) and check all applicable federal, state, and local laws before purchasing.
Colt-Pattern AR9 Lowers
If you’re building a 9mm AR around the classic straight-mag platform, you’re in the right place. Our Colt-pattern AR9 lowers are designed for builders who prefer the proven double-stack, double-feed magazine system originally used in the Colt-style SMG platform.
Modern Features, Classic Compatibility
While the original Colt-style lowers were built decades ago, today’s builders expect more. Our Colt-pattern lowers include:
- Billet 6061-T6 aluminum construction
- Integrated trigger guard
- Flared magwell
- Fully ambidextrous controls
- Last-round bolt hold open
- Precision-machined steel internals
Built for Builders
At 80% Arms, we focus on precision machining, in-house manufacturing, and consistent supply. Our goal is simple: give builders a high-quality Colt-pattern lower without outdated features or inconsistent availability.
Building a firearm for personal use is legal for non-prohibited persons in most states. Under the Gun Control Act (GCA), prohibited persons — including convicted felons, fugitives from justice, unlawful users of controlled substances, and others defined under 18 U.S.C. § 922(g) — may not possess, receive, or manufacture any firearm. It is your responsibility to know and comply with all applicable federal, state, and local laws before purchasing or building.
Colt® is a trademark of Colt’s Manufacturing Company LLC. Glock® is a trademark of GLOCK, Inc. Some components on our site are genuine Colt® OEM components, while other parts including our 80% lowers are aftermarket parts which are not produced by or endorsed by Colt’s Manufacturing Company LLC or GLOCK, Inc. Aftermarket and OEM products are clearly marked to avoid confusion.