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.

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

Frequently Asked Questions

✓ Nationwide delivery (all 50 states)
✓ Ships 1-2 business days
✓ 30-day returns
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Browse more options in our AR Rifles, 9mm PCCs, and Angstadt Arms collections.

Last updated: April 2026