Knights Armament Sr-25 A2 7.62 Nato/.308 20'' Bbl Assembled Upper Rcvr Black

The Knights Armament SR-25 A2 is a 7.62 NATO/.308 assembled upper receiver purpose-built for shooters who demand precision at distance. This commercial variant of the M110A2 system brings proven military accuracy and reliability to your semi-automatic rifle build. Whether you're assembling a long-range hunting upper, a precision carbine for the range, or a duty-grade platform, the SR-25 A2 delivers the engineering that made the M110 platform a standard in precision rifle work.

The 20-inch barrel features a 5R cut rifled profile with a 1:10-inch twist rate, paired with a high-pressure dual ejector bolt designed to function reliably in suppressed and unsuppressed configurations, even in tough conditions. Fully ambidextrous controls across the receiver mean both left- and right-handed shooters get full ergonomic advantage without compromise. The integrated 2-stage trigger is tuned to support precision work without requiring additional tuning or parts swaps.

Mounted to the upper is the URX6 handguard—a rigid, impact-resistant design with seven sides of M-LOK slots and a continuous MILSTD-1913 rail across the top. This gives you maximum flexibility to mount optics, lights, lasers, or other modern accessories. The 7.62mm open brake mitigates recoil and is compatible with KAC 7.62mm QDC Signature Reduction Devices, so you can suppress this upper if your setup calls for it.

This is a complete assembled upper receiver—bolt carrier group and trigger are installed and ready to mate with your compatible lower receiver. It's a no-compromise choice for builders who refuse to compromise on accuracy or durability.

Key Features

• 20-inch 5R cut barrel, 1:10-inch twist, dimpled profile
• High-pressure dual ejector bolt for reliable suppressed and unsuppressed performance
• Fully ambidextrous controls for shooters of any hand orientation
• 2-stage drop-in trigger optimized for precision marksmanship
• URX6 handguard with seven M-LOK slots and continuous top rail
• 7.62mm open brake compatible with KAC QDC suppressors
• Fully assembled and ready to pair with compatible lower receiver

Specifications

Frequently Asked Questions

What lower receiver is this upper compatible with?

The SR-25 A2 is an assembled upper receiver designed to pair with AR-10 pattern lower receivers that accept 7.62 NATO/.308 Winchester ammunition. Verify compatibility with your specific lower receiver before assembly.

Can I mount a suppressor to this upper?

Yes. The 7.62mm open brake is compatible with KAC 7.62mm QDC Signature Reduction Devices. The dual ejector bolt is specifically designed to cycle reliably both suppressed and unsuppressed.

Is this upper fully assembled?

Yes, this is a complete assembled upper receiver with the bolt carrier group and 2-stage trigger installed. You'll need to attach it to a compatible AR-10 lower receiver to complete your rifle.

What accessories can I mount to the handguard?

The URX6 handguard features seven sides of M-LOK slots for mounting custom rail sections and accessories, plus a continuous MILSTD-1913 rail across the top for direct attachment of optics, lights, and other standard rail-mounted gear.