Knights Armament Sr-25 K6 6.5Mm Creedmoor 16'' Bbl Assembled Upper Rcvr Black

The Knights Armament SR-25 K6 6.5mm Creedmoor assembled upper receiver is a purpose-built upper for shooters who demand precision rifle performance in a practical, carryable platform. Designed as the commercial variant of the proven M110K6, this 16-inch upper trades the longer sight radius of traditional precision rifles for speed and portability without sacrificing ballistic efficiency. The 6.5mm Creedmoor cartridge delivers performance that exceeds full-length 7.62mm configurations, making this upper well-suited for mid-range precision work, competitive shooting, hunting at extended distance, or tactical applications where mobility matters.

The barrel itself is built to exacting standards—a 416R stainless steel tube with 5R rifling, dimpled for stress relief, and a 1:7.5-inch twist rate optimized for 6.5 Creedmoor ammunition. The high-pressure dual ejector bolt cycles reliably in adverse conditions and with sound suppressors, extending service life over standard designs. Controls are fully ambidextrous, giving left-handed shooters the ergonomic advantages of the AR-15 platform while allowing all users faster, more efficient weapon manipulation during dynamic shooting.

The URX6 handguard is where versatility shines: seven sides of M-LOK slots let you mount lights, lasers, slings, and other gear exactly where you need them, while the continuous top rail (MIL-STD-1913) accepts optics, magnified sights, or accessories without compromise. Impact resistance means it won't shift under recoil or rough handling. The 7.62mm open brake manages recoil effectively and works with Knights Armament's QDC Signature Reduction Devices if you plan to run a suppressor. A drop-in 2-stage trigger aids precision marksmanship out of the box.

This is a complete, assembled upper receiver—meaning it arrives ready to mate with your existing lower receiver and bolt carrier group. It's the platform choice for shooters who want genuine precision rifle capability without the weight and length of a traditional long-range build.

Key Features

• 16-inch 416R stainless steel barrel with 5R rifling and 1:7.5-inch twist for 6.5mm Creedmoor
• High-pressure dual ejector bolt for reliable suppressed and unsuppressed operation
• Fully ambidextrous controls for all users and left-handed shooters
• URX6 handguard with seven M-LOK mounting surfaces and continuous top Picatinny rail
• Drop-in 2-stage trigger for precision shooting
• 7.62mm open brake compatible with KAC QDC suppressor devices
• Assembled and ready to integrate with AR-pattern lower receiver

Specifications

Frequently Asked Questions

What lower receiver does this upper fit?

This is an AR-pattern upper receiver designed to mate with standard AR-15 style lower receivers. Ensure your lower is in good condition and properly assembled before attaching this upper.

Can I use a suppressor with this upper?

Yes. The 7.62mm open brake is compatible with Knights Armament KAC 7.62mm QDC Signature Reduction Devices. The dual ejector bolt is also engineered to cycle reliably with suppressors installed.

What makes the 5R rifling and dimpled barrel different?

5R rifling reduces bullet deformation and improves accuracy while lowering fouling compared to traditional 4-groove designs. The dimpling relieves stress in the barrel steel, enhancing durability and consistency over extended shooting sessions.

Is the trigger adjustable?

The drop-in 2-stage trigger is factory-set to aid precision marksmanship. Specific adjustment details are not included in the product specifications; consult Knights Armament documentation or a qualified gunsmith for any modifications.