The Knights Armament SR-25 K3 7.62 NATO/.308 16" BBL Assembled Upper Receiver Black brings the proven SR-25 lineage into a compact, mid-length package focused on precision and control. Built around a 16-inch 5R cut-rifled 416R stainless steel barrel with a threaded muzzle and 7.62mm open brake, this upper is engineered for consistent accuracy, reduced recoil, and reliable function with both suppressed and unsuppressed setups. A high-pressure dual-ejector bolt, URX6 free-float handguard with M-LOK slots, and fully ambidextrous controls round out a refined, duty-ready upper assembly.

This SR-25 K3 upper is ideal for shooters who want a premium 7.62 NATO/.308 semi-automatic platform for precise mid-range work, training, and general range use. The continuous MIL-STD-1913 top rail and M-LOK handguard make it easy to configure with optics, lights, and other accessories, while the included drop-in two-stage trigger supports clean, predictable breaks for tighter groups. Pair it with a compatible SR-25 pattern lower to create a balanced rifle that reflects Knights Armament’s reputation for meticulous engineering and long-term reliability.

Key Features:

• Manufacturer: Knights Armament
• Model: SR-25 K3 7.62 NATO/.308 16" BBL Assembled Upper Receiver
• Caliber: 7.62 NATO / .308 Winchester
• Barrel Length: 16 inches
• Barrel Material: 416R Stainless Steel
• Rifling: 5R Cut, 1:10" Twist
• Attachment Type: M-LOK With MIL-STD-1913 Top Rail
• Gas System Length: Mid-Length
• Muzzle Device: 7.62mm Open Brake, Threaded Barrel
• Bolt Type: High-Pressure Dual-Ejector
• Handguard: URX6 Free-Float
• Trigger: Drop-In Two-Stage
• Receiver Style: Assembled Upper Receiver
• Item Weight: 6.8 lbs