Knight's Armament SR-25 K5 | Upper Receiver Kit

The Knight’s Armament SR-25 K5 Upper Receiver Kit is a factory-configured upper designed for SR-25 pattern rifles chambered in 7.62 NATO / .308 Winchester. It features a 14.5-inch cold hammer forged barrel constructed from 32CrMoV12-10 steel with a chrome-lined bore and a 1:10 twist rate. The hybrid light profile is intended to reduce overall weight while maintaining durability and consistent performance. The upper is paired with an M-LOK compatible handguard for flexible accessory mounting.

This upper receiver kit includes a complete bolt carrier group with the E2 bolt, charging handle, and a compatible muzzle device. Additional components include front and rear micro iron sights, an M-LOK to Picatinny rail section, an M-LOK QD sling adapter, and an H2 buffer. The included components provide a complete upper assembly suitable for users seeking compatibility with large-frame AR platforms.

Specifications

• Caliber: 7.62 NATO / .308 Winchester
• Barrel Length: 14.5 in (36.8 cm)
• Barrel Material: 32CrMoV12-10 steel
• Barrel Type: Cold hammer forged, chrome lined
• Twist Rate: 1:10
• Barrel Profile: Hybrid light profile
• Handguard: M-LOK compatible
• Bolt Carrier Group: Included with E2 bolt
• Charging Handle: Included
• Muzzle Device: Included
• Sights: Front and rear 600m micro iron sights included
• Accessories Included:
  • M-LOK to Picatinny rail section
  • M-LOK QD sling adapter
  • H2 buffer