Mil-Spec M5 Rifle RAS for M16A4 with full rail covers

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Mil-Spec Rifle RAS, 5.56, New with rail covers


Same as the Knights Armament KAC M5 Rifle RAS Forend Assembly for M16, complete with four (4) 11-rib RAS rail covers, two (2) 5-rib rib rail covers and one (1) 6-rib rail cover.

This is the identical product to the KAC M5 RAS (Rail Adapter System) was developed for use on the US military’s M16A4, and with hundreds of thousands of rails issued to date, it is one of the most battle proven designs available for the AR-15 platform.

Military-Grade Excellence

Unleash the full potential of your M16clone build with Charlie's Mil-Spec Rifle RAS, a product identical to the Knights Armament KAC M5 Rifle RAS Forend Assembly. This drop-in replacement part comes complete with four 11-rib RAS rail covers, two 5-rib rail covers, and one 6-rib rail cover. Developed for use on the US military’s M16A4, this Rail Adapter System is one of the most battle-tested designs available for the AR-15 platform.

Prudent American & P&S: The Seal of Quality

Manufactured by P&S Products and now under the parent name of Prudent American Technologies (PAT) since 2022, this product ensures the same quality and compatibility as its KAC counterpart. Both P&S and KAC are esteemed DOD military contractors, providing the M16 Rifle RAS to the US Military. This Prudent American - P&S branded product offers you quality at a more affordable price and tends to be more readily available. It accepts KAC, P&S, or Prudent American rail covers, ensuring seamless adaptability.

Unparalleled Versatility and Secure Fit

This non-free float handguard is a simple yet powerful upgrade that provides genuine Mil-Spec M1913 Picatinny Rails along its entire length. It sets itself apart from other 2-piece quad rails with its secure locking to the rifle’s barrel nut via a clamp and screw arrangement. This results in a rock-solid foundation for mounting your tactical accessories. With multiple rib rail panels included, you can customize your setup to suit your specific needs.

Ease of Installation and Compatibility

The M5 RAS is designed as a drop-in replacement for standard, 2-piece polymer, A2-type handguards. It can be installed on rifles featuring a rifle length gas system, delta ring assembly, fixed front sight/gas block, and either a round or triangular handguard end cap. While it works best with lighter barrel profiles (like Government contours), heavier barrel contours may require modification to the inside of the rail. This product is exclusive to AR-15/SR-15 based platforms and not compatible with SR-25 variants. Installation instructions are included to guide you every step of the way.

Complete Accessory Package

In addition to the main assembly, the M5 RAS package includes four PAT 11-Rib Rail Panels, two 5-Rib panels, and one 6-Rib panel. This assortment of panels offers the flexibility to customize your M16 to your liking. Moreover, when not using a vertical grip, one of the 11-rib rails can conveniently replace the 6-rib panel, further enhancing your customization options.

The Charlie's Advantage

At Charlie's, we stock both P&S military surplus and Prudent American new products, promising you a wide array of quality options to suit your needs. We strive to bring you the best, whether it's a proven military-grade product or a competitively priced alternative. Choose Charlie's for your M16 upgrade and clone builds and experience the difference of top-tier quality and customer service.

Includes four PAT 11-Rib Rail Panels, two 5-Rib panels, and one 6-Rib panel. One of the 11-rib rails can replace the 6-rib panel when not using a Vertical grip.

Note: Vertical grip is an optional add-on and does not come with this railTo add milspec vertical grip, click here

Summary Specifications

Military Grade:   Yes
Material: Aluminum
Finish: Black Anodizing
Covers Included:   four (4) 11-rib
  two (2) 5-rib
  one (1) 6-rib
T-Marks: Yes
Compare to: Knights Armament (KAC)
Free-Floating: No
Length: 11.5"
Weight: 14.4 oz

Colt has started using Prudent American M4 carbine stocks in 2022 as their provider.  In the past, Colt used P&S Products.  We can get too hung up on names and markings, but P&S and Prudent American are the real deal in military contracted parts.

Note on availability:  Charlies has contracted with Prudent American for new RAS rails, with CAGE code 8FW25.