Knights Mfg Co. 98065 M5 AR-15/SR-15 5.56x45mm NATO Black Anodized Aluminum Rifle

The Knights Mfg Co. M5 RAS (Rail Adapter System) is a proven AR-15 handguard designed for shooters who need a solid, battle-tested platform for mounting tactical accessories. Born from military service on the M16A4, this quad-rail handguard has logged hundreds of thousands of hours in the field—making it one of the most reliable drop-in upgrades available for the AR-15 platform. Unlike lighter or simpler rail systems, the M5 locks directly to your rifle's barrel nut via a clamp and screw mechanism, creating a rigid foundation that won't shift under recoil or the weight of optics, lights, and other gear.

This is a non-free float design, which means it interfaces with your rifle's delta ring assembly in the traditional manner. Installation is straightforward for anyone familiar with AR-15 maintenance—it's a drop-in replacement for the standard two-piece polymer A2-type handguard. The entire rail surface is milled with genuine Mil-Spec M1913 Picatinny rails, giving you maximum flexibility to configure your setup exactly how you need it. Three KAC 11 Rib Rail Panels are included to help manage cable routing and reduce rail clutter.

The M5 RAS is machined from black anodized aluminum for durability and corrosion resistance. Your rifle must have a rifle-length gas system, delta ring assembly, fixed front sight or gas block, and either a round or triangular handguard end cap to accept this handguard. Lighter barrel profiles (Government contours) install without issue; heavier barrels may require minor modification to the inside of the rail. This handguard is compatible with AR-15 and SR-15 platforms only—it will not fit SR-25 variants. Installation instructions are included.

Key Features

• Full-length Mil-Spec M1913 Picatinny rails for unlimited accessory mounting
• Barrel nut clamp and screw system ensures rock-solid lock with zero shift
• Battle-proven design with hundreds of thousands of military service hours
• Simple drop-in installation for standard rifle-length AR-15 systems
• Black anodized aluminum construction resists corrosion
• Three KAC 11 Rib Rail Panels included for cable and gear management

Specifications

Frequently Asked Questions

Will the M5 RAS fit my AR-15?

The M5 RAS is designed as a drop-in replacement for standard two-piece polymer A2-type handguards. Your rifle must have a rifle-length gas system, delta ring assembly, a fixed front sight or gas block, and either a round or triangular handguard end cap. It is compatible with AR-15 and SR-15 platforms only—not SR-25 variants. Lighter barrel profiles (Government contours) are ideal; heavier barrels may require modification to the inside of the rail.

What makes the M5 RAS more solid than other quad rails?

Unlike many quad-rail handguards that rely on standard delta ring retention, the M5 RAS locks directly to the barrel nut using a dedicated clamp and screw arrangement. This creates a far more rigid connection that resists shifting and flex under the weight of mounted accessories and recoil.

What comes in the box?

The M5 RAS handguard includes three KAC 11 Rib Rail Panels and installation instructions. The rail panels help organize cables and reduce clutter on the rails.

Is this handguard free-floated?

No. The M5 RAS is a non-free float design that interfaces with your rifle's delta ring assembly in the traditional manner, similar to the factory A2 handguard.