Knights RAS 7″ Drop-In AR15/M4 Carbine Length Quad Rail


Knights RAS 7″ Drop-In AR15/M4 Carbine Length Quad Rail


The Knights Armament M4 RAS (Rail Adapter System) was developed for use on US military M4 Carbines utilized a 14.5 or 16″ barrel. With over 1 million rails issued to date, it is one of the most battle proven designs available for the AR15 platform. This 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 RAS apart from other 2-piece quad rails on the market is that it securely locks to the rifleā€™s barrel nut via a clamp and screw arrangement, making it a very solid foundation upon which to mount tactical accessories.

The KAC M4 RAS 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 AR15/SR15 based platforms only; not compatible with SR-25 variants.

Installation instructions are included.


  • Installs in minutes
  • Four MIL-STD Picatinny rails at 12, 3, 6, and 9 o’clock
  • Includes 3x Rail Protection Panels
  • Compatible with carbine length gas systems


  • Weight: 8.9 oz
  • Length: 6.25″
  • Machined from 6061/T651 Aircraft Grade Aluminum
  • Mil-Spec hard coat anodized


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