Knight's Armament SR-15 KS-2 - 5.56mm 14.5" Upper Receiver Kit

Knight's Armament SR-15 KS-2 - 5.56mm 14.5" Upper Receiver Kit

The Knight’s Armament SR-15 KS-2 14.5" Upper Receiver Kit represents the gold standard in modern AR-15 upper receiver systems, engineered by Knight’s Armament Company for shooters who demand uncompromising reliability, precision, and battlefield-proven durability. Built around a cold hammer forged, chrome-lined barrel and paired with the legendary E3.2 bolt system, this upper transforms any compatible lower receiver into a high-performance rifle system designed to excel under sustained use.

With its 14.5-inch barrel and mid-length gas system, the KS-2 delivers a refined shooting impulse with reduced recoil and improved control for faster follow-up shots. The free-floating M-LOK URX 4 handguard enhances modularity while maintaining a lightweight, streamlined profile, allowing users to configure optics, lights, grips, and mission-critical accessories without sacrificing balance or handling.

Every component reflects Knight’s Armament’s commitment to military-spec engineering, from the 7075-T6 aluminum upper receiver to the proprietary E3 bolt design that reduces wear and improves extraction reliability under harsh conditions. Whether used for duty, defensive applications, or precision training, the SR-15 KS-2 is built to deliver consistent performance when it matters most.

Cold Hammer Forged Chrome-Lined Barrel
14.5" barrel with 1:7 twist rate enhances barrel life, heat resistance, and long-term accuracy under sustained fire conditions.

E3.2 Enhanced Bolt Carrier System
Proprietary bolt design reduces friction and improves extraction reliability, minimizing malfunctions in adverse environments.

URX 4 Free-Float M-LOK Handguard
Lightweight modular rail system provides secure accessory mounting while improving ergonomics and heat management.

Mid-Length Gas System
Optimized gas timing reduces recoil impulse and muzzle rise for smoother, more controllable shooting.

7075-T6 Aluminum Upper Receiver
Mil-spec strength with corrosion-resistant Type III hardcoat anodized finish for long-term durability.

600m Micro Iron Sights Included
Front and rear sights provide reliable backup aiming capability in all conditions.

Accessory-Ready Configuration
Includes M-LOK QD sling adapter and rail section for immediate modular customization.

Specifications

• Caliber: 5.56 NATO
• Barrel Length: 14.5 inches
• Barrel Type: Cold hammer forged, chrome-lined steel
• Barrel Twist Rate: 1:7
• Gas System: Mid-length
• Handguard: URX 4 M-LOK free-float system
• Receiver Material: 7075-T6 aluminum
• Receiver Finish: Type III hardcoat anodized black
• Bolt Carrier Group: Included, E3.2 enhanced bolt design
• Charging Handle: Included
• Muzzle Device: Included (factory-installed)
• Sights: Front and rear 600-meter micro iron sights included
• Accessory Mounting: M-LOK compatible with included rail section
• Sling Attachment: M-LOK QD sling adapter included
• Buffer System: H2 buffer included
• Weight: Approx. 4 lbs (upper assembly)
• Compatibility: Standard mil-spec AR-15 lower receivers