Angstadt Arms UDP-9 Rifle 9mm Luger 15rd Magazine 16″ 1/2×28 Threaded Barrel Black

Description

The Angstadt Arms UDP-9 Rifle in 9mm Luger with a 15-round magazine, 16-inch barrel, and 1/2×28 threaded muzzle is a purpose-built AR-15 platform chambered for the 9mm cartridge. It accepts double-stack GLOCK magazines and retains last-round bolt hold-open, making it a reliable choice for shooters who value compatibility and function over flash. This is a solid, no-nonsense rifle for those who appreciate traditional craftsmanship in modern firearms.

Manufacturer	Angstadt Arms
Model	UDP-9
Material	7075-T6 Billet Aluminum (upper and lower receivers)
Compatibility	GLOCK 9mm double-stack magazines (G17, G19, etc.)
Finish	Matte Black Hard-Coat Anodized (per manufacturer specs)
Weight	Approximately 5.5 lbs (unloaded, per manufacturer specs)
Condition	New

Key Features

• Last Round Bolt Hold-Open — This feature locks the bolt back after the final shot, giving you a clear visual and tactile indicator that the magazine is empty. It speeds up reloads and keeps you in the fight without guesswork.
• Flared Magwell — The widened magazine well guide helps you seat magazines faster, even under pressure or with gloved hands. It reduces fumbling and saves time during reload drills.
• Integrated Oversized Trigger Guard — The receiver is machined with a larger trigger guard that accommodates gloved fingers, so you can shoot comfortably in cold weather or tactical conditions without modifying the gun.
• Threaded Bolt Catch Screw — A small but important detail: the bolt catch uses a threaded screw instead of a roll pin, making disassembly and maintenance simpler. This is a nod to user-friendly design that experienced builders appreciate.
• 9mm Bolt Assembly with Standard AR-15 Buffer System — The UDP-9 uses a dedicated 9mm bolt that works with a standard AR-15 carbine buffer and spring, simplifying parts compatibility and tuning. It runs reliably with common 9mm ammunition.

Who It’s For

This rifle is for the shooter who wants a reliable 9mm AR without the compromises of a converted .223 platform. It’s ideal for competition shooters in PCC (Pistol Caliber Carbine) classes, home defense users who prefer a lighter recoil impulse, and anyone who already owns GLOCK pistols and wants magazine commonality. It also appeals to traditionalists who value billet aluminum construction and a clean, slick-side upper receiver without a forward assist or dust cover—just the essentials.

Pros and Cons

Pros

• Lightweight at around 5.5 lbs, easy to carry and maneuver.
• Accepts widely available GLOCK magazines.
• Billet 7075-T6 aluminum receivers are durable and precise.
• Threaded barrel (1/2×28) accepts standard 9mm muzzle devices or suppressors.
• Last round bolt hold-open works reliably with GLOCK mags.

Cons

• No forward assist or dust cover—some shooters prefer these for duty use, though the design is intentional for simplicity.
• Compatibility with aftermarket triggers may require careful selection due to the 9mm bolt carrier profile.

Comparison: Angstadt Arms UDP-9 vs. Zev Technologies OZ9 Carbine vs. Lone Wolf Distributors G9

Feature	Angstadt Arms UDP-9	Zev Technologies OZ9 Carbine	Lone Wolf Distributors G9
Receiver Material	7075-T6 Billet Aluminum	7075-T6 Billet Aluminum	Forged 6061 Aluminum
Magazine Compatibility	GLOCK double-stack 9mm	GLOCK double-stack 9mm	GLOCK double-stack 9mm
Barrel Length	16 inches	16 inches	16 inches
Weight (approx.)	5.5 lbs	6.2 lbs	5.8 lbs
MSRP	$1,190	$1,799	$899
Bolt Hold-Open	Last round (with GLOCK mags)	Last round (with GLOCK mags)	Last round (with GLOCK mags)
Finish	Matte Black Hard-Coat Anodized	Black Nitride	Black Anodized

Frequently Asked Questions

Does the Angstadt Arms UDP-9 work with all GLOCK 9mm magazines?

Yes, the UDP-9 is designed to accept standard double-stack GLOCK 9mm magazines, including G17, G19, G26, and aftermarket options like Magpul PMAGs for GLOCK. It reliably feeds from all of these.

Can I use a suppressor with the threaded barrel?

Yes, the 1/2×28 threaded barrel is standard for 9mm suppressors. You’ll need a compatible suppressor mount or direct-thread adapter. Just ensure the barrel is long enough (16 inches) to comply with NFA regulations if you’re adding a suppressor.

Is the UDP-9 compatible with standard AR-15 triggers?

It works with many standard AR-15 triggers, but because the 9mm bolt carrier is shorter, some triggers may need adjustment. Angstadt recommends using a drop-in trigger or a standard mil-spec trigger for best reliability.

What is the weight of the UDP-9 rifle?

Per Angstadt Arms specs, the UDP-9 weighs approximately 5.5 pounds unloaded. This makes it lighter than many 9mm AR carbines on the market.

✓ Nationwide delivery (all 50 states)
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Last updated: April 2026