Knights Mfg Company 21318 Free Float Rifle RAS AR-15/SR-15 12" Black Anodized Aluminum with (3) 11-Rib Rail Panels

The Knights Mfg Company Free Float Rifle RAS is a 12-inch AR-15/SR-15 handguard engineered for shooters who demand both accuracy and modularity. This black anodized aluminum rail system decouples the barrel from the forend, letting your barrel vibrate naturally without interference—the key to consistent shot placement at distance or on the bench. If you're building a precision rifle, upgrading from factory plastic, or simply want serious Picatinny real estate for mounting lights, lasers, vertical grips, and other tactical gear, this is the kind of handguard that earns its reputation through actual field service.

The RAS features full-length mil-spec M1913 Picatinny rail sections at 12, 3, 6, and 9 o'clock positions, giving you unlimited mounting flexibility and the ability to configure your rifle exactly how you shoot it. The included three 11-rib rail panels let you fill gaps, protect your hand from sharp edges, and customize the ergonomics to your preference. The modular design means you can swap panels as your mission or setup changes—no tools required.

Installation does require disassembly of your gas system and removal of the factory barrel nut. The RAS uses a proprietary barrel nut that installs with a standard AR-15 armorer's wrench (not included). This isn't a drop-in forend; plan on a proper setup, ideally at a gunsmith if you're not comfortable working on your rifle's internals. Your carbine or mid-length gas system and low-profile gas block are requirements. Installation instructions are included in the box.

Compatible with AR-15 and SR-15 platforms only—SR-25 variants are not compatible. This is purpose-built for serious shooters ready to invest in a handguard that delivers on accuracy and versatility.

Key Features

• Free-floating barrel design for improved harmonic consistency and accuracy
• Full-length Picatinny rails at 12, 3, 6, and 9 o'clock positions
• Three 11-rib rail panels included for coverage and hand protection
• Black anodized aluminum construction
• Modular, tool-free rail panel swapping
• Fits carbine and mid-length gas systems with low-profile gas blocks

Specifications

Frequently Asked Questions

Will this handguard fit my AR-15?

The RAS is designed for AR-15 and SR-15 platforms with carbine or mid-length gas systems and a low-profile gas block. It is not compatible with SR-25 variants. Your rifle's gas system and block must meet these specifications for proper fit and function.

What do I need to install this handguard?

You'll need to disassemble your rifle's gas system, remove the factory barrel nut, and install the RAS using its proprietary barrel nut. A standard AR-15 armorer's wrench is required (sold separately). Installation instructions are included. If you're not comfortable with these steps, have a gunsmith handle the install.

Can I add lights, lasers, and other rail-mounted accessories?

Yes. The full-length Picatinny rails at 12, 3, 6, and 9 o'clock positions accept any mil-spec rail-mounted gear. The included rail panels can be removed or swapped to accommodate your setup.

Does this improve accuracy?

Free-floating the barrel removes pressure points that can affect shot-to-shot consistency. By allowing your barrel to vibrate naturally, the RAS helps achieve more predictable barrel harmonics, which translates to tighter groups—particularly valuable for precision shooting, hunting, and long-range applications.