United States Army Marksmanship Unit · Sniper-Rifle · In Service · 2003
| Weight (empty) | 4100 g (144.6 oz) |
| Overall Length | 1003 mm (39.49") |
| Barrel Length | 508 mm (20.00") |
| Magazine Capacity | 30 rounds |
| Action Type | Gas Operated Direct Impingement |
| Firing Mechanism | Rotating Bolt |
| Muzzle Velocity | 940 m/s (3084 fps) |
| Muzzle Energy | 1776 J (1310 ft·lbf) |
| Effective Range | 600 m (656 yd) |
| Frame Material | Aluminum Alloy |
Primary Caliber: 5.56x45mm NATO
The Squad Designated Marksman Rifle (SDM-R) is an accurized M16-based designated marksman rifle built by the United States Army Marksmanship Unit (AMU) for deployment with the 3rd Infantry Division in Iraq. Approximately 240 rifles were hand-built by AMU armorers, creating a precision weapon system that extended the infantry squad's effective engagement range to 600 meters using the standard 5.56x45mm NATO cartridge. The SDM-R replaces the standard M16A2/A4 barrel with a fluted 20-inch stainless...
Country of Origin: United States