Knights Armament Company (KAC) M4 RAS for M4 Carbines (#98064)

Machined from aircraft grade aluminum
Stock Status:

Out of stock

As issued to US troops for the M4 and M4A1 carbines. The M4 Carbine RAS converts AR-15, M4, M4A1 carbines with Mil-Spec M4 profile (.840" diameter) barrels into the MWS (Modular Weapon System) configurations. Installs without special gunsmithing tools. Includes a quantity of 3 black KAC 11 Rib panels. P/N: 98064
***This product contains chemicals/materials known to the State of California to cause cancer and other reproductive harm. To learn more, visit***

3 Reviews

  • 5
    top notch rail

    I like the way it locks in, steady will not move. I can tell it can take the abuse..rock solid.. It worked perfect with my Colt Heavy barrel...did not have to modify it if you have a Colt Heavy barrel it will work.

  • 5
    Best in Slot

    If you're looking at this it's because you know it's the best drop-in carbine quad rail ever made, so if you're reading the reviews it's only for to verify it's the right part for your USMC clone, and it is the right part so go ahead and add to cart. Bravo Company is an awesome company and the price was spot on, had mine on my rifle 3 days after I clicked the buy button. Why on earth are you still reading my crappy review??? Buy it already.

  • 3
    Heavy and Uncomfortable

    Used this rail in the Army. It's pretty heavy for what it is, never realized just how bad until I handled a friends civilian M4-clone with a Larue rail installed. Also it's very uncomfortable, the KAC rail covers are terrrible. I'm giving it 3 stars because it still does it's basic job: it is a quad rail. Also it's relatively easy to remove for cleaning.