The Angstadt Arms UDP-9 is a compact AR-style pistol chambered in 9mm and built for range work, pistol-caliber carbine competitions, and close-quarters applications. Its compact footprint and threaded barrel make it suited to users seeking a purpose-built 9mm AR platform.

The UDP-9 pairs billet 7075-T6 aluminum upper and lower receivers with ergonomic features such as a flared magwell and an oversized trigger guard for gloved use. The design omits a forward assist and dust cover, and it uses a 9mm bolt assembly compatible with standard AR-15 hammers; the package also includes a continuous top mil-spec 1913 Picatinny rail for optics.

Key Specifications

The caliber is 9mm Luger.
The barrel length is 6 inches.
The barrel is threaded 1/2×28 for accessory attachment.
The free-float M-LOK handguard length is 5.50 inches.
The upper and lower receivers are made from 7075-T6 billet aluminum.
The finish options include matte black hard-coat anodized, Flat Dark Earth Cerakote, and Tactical Grey Cerakote.
The fire control group is Mil-Spec AR-15/M4.
The pistol accepts Glock-style magazines and is compatible with most aftermarket Glock magazines.
The top rail is a continuous mil-spec 1913 Picatinny rail for optics and accessories.
The overall length is 22 inches and the weight is sub 5 lbs.

The UDP-9 includes user-focused ergonomics such as a flared magwell, integrated oversized trigger guard, a B5 Systems pistol grip, and a threaded bolt catch screw to aid maintenance and function. The platform is compatible with many aftermarket 9mm PCC triggers and accepts most Glock-pattern magazines for parts commonality.

Buy the Angstadt Arms UDP-9 9mm Luger online today to add a compact, billet-built AR-style 9mm pistol to your collection.