Knights Armament RIS M4 Carbine Length Quad Rail Forearm System 


Knights Armament RIS M4 Carbine Length Quad Rail Forearm System


Knight's Armament

Sold Out

Product Info & Specs

Knights Armament RIS M4 Carbine Length Quad Rail Forearm System 

The KAC M4 RIS (Rail Interface System) was developed for use on the US military’s M4 Carbine, and with over 1 million rails issued to date, it is one of the most battle proven designs available for the AR-15 platform. This non-free float handguard is a simple-to-install, drop-in upgrade that features genuine Mil-Spec M1913 Picatinny Rails along its entire length. What sets the M4 RIS apart from other 2-piece quad rails on the market is that it securely locks to the rifle’s barrel nut via a clamp and screw arrangement, making it a very solid foundation upon which to mount tactical accessories.

Rifle Requirements: The M4 RIS is a drop-in replacement part for standard, 2-piece polymer, M4-type handguards. The rifle must have a carbine length gas system, delta ring assembly, fixed front sight/gas block, and round handguard end cap. Lighter barrel profiles work best (M4 or Government contours). Heavier barrel contours may require modification to the inside of the rail. For AR-15/SR-15 based platforms only; not compatible with SR-25 variants.

Requires only a flat head screwdriver for installation and can be drop fitted in.  This is the rail you would want to use for a correct CQBR Mk18 Mod 0 Crane rifle build. It is also great for M4A1 block 1 SOPMOD builds as well as any AR-15 with a front sight post and a delta ring around the barrel nut for a drop in rail option.  These are new take offs. May have a small scuff here or there but most of them are in great shape.  The RIS forend system is the earlier rail system prior to the introduction of the KAC RAS system.  The RIS rail system is numbered T-L-R-B (top- left-right-bottom) in odd numbers 1 – 13 beginning at the front sight and ending at the upper receiver.

Manufacturer Knights Armament
Part RIS M4 Carbine Quad Rail Forend Assembly
Material Aluminum
Length 6.25”
Finish Black Anodizing
Weight 8.9 ounces
Fit AR-15 & Variants
Free Float No
Mfg Part Number  94297   Cage Number: 1S002

Additional information

Weight 1 lbs
Dimensions 7 × 3 × 3 in