Angstadt Arms · Pistol · In Production · 2017
| Weight (empty) | 2268 g (80.0 oz) |
| Overall Length | 686 mm (27.01") |
| Barrel Length | 292 mm (11.50") |
| Height | 200 mm (7.87") |
| Width | 64 mm (2.52") |
| Magazine Capacity | 30 rounds |
| Action Type | Gas Operated Direct Impingement |
| Firing Mechanism | Hammer Fired |
| Muzzle Velocity | 850 m/s (2789 fps) |
| Muzzle Energy | 1445 J (1066 ft·lbf) |
| Effective Range | 300 m (328 yd) |
| Frame Material | Aluminum Alloy |
Primary Caliber: 5.56x45mm NATO
The Angstadt Arms UDP-556 is a billet-aluminum AR-15 chambered in 5.56x45mm NATO, built on the same fully machined 7075-T6 receiver architecture as the company's AR-9 pistols. It is offered across 10.5-inch and 11.5-inch pistol/SBR configurations and a 16-inch non-NFA rifle, all with chrome moly Melonite barrels, 1/7 twist, 1/2x28 threading and an A2-style flash suppressor. The lower features an integrated oversized trigger guard and flared magwell for faster STANAG magazine reloads, and the rif...
Country of Origin: United States
Designer: Angstadt Arms