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Questions & Answers
Will this Quad rail fit a heavy profile or socom barrel? Expert Answer

As long as the upper uses a drop in handguard with a round endcap and uses a carbine length gas system it should fit.

by Jonathan D., Gear Expert, October 13, 2018
Does this come with the vertical foregrip? Expert Answer

It will not come with the vertical foregrip.

by Armando R., Gear Expert, May 30, 2018
Customer Reviews
Helpful Positive Review
Knights Armament RAS by mikei, Verified Owner, June 15, 2018
I mounted this on a Colt 6920. I pre ordered it and five weeks later it was delivered. It was definitely worth the wait. Mounting it was a snap. It locked up tight with no issues whatsoever. I was going to buy a used one on E bay but was concerned a...
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14/14 found this helpful
Helpful Positive Review
One of the Best by Topher, Verified Owner, May 4, 2020
Great Forearm. Titusville production model came with three 11 rib covers. Fit with no issues over a Colt SOCOM barrel and is rock solid. Used this to replace a Troy Battle Comp quad rail on an otherwise all Colt upper to increase its value. Not that ...
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1/1 found this helpful
Helpful Positive Review
The Real Deal by Bb, October 19, 2018
Awesome. I can see why this is the gold standard for non-floating m4 handguard/rail systems. The attachment design is perfect and fits like a glove. It’s a little pricey, but you definitely get what you pay for with this item.
3/3 found this helpful
Helpful Negative Review
Poor Quality! by Waldon Cook, October 8, 2020
Didn't use these in the military when I was in, but thought I would go for a modern day clone, and glad its just a clone. This rail is a pos! The top wouldn't even fit at all, and the bottom was loose as a goose. After doing a better machining job th...
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1/18 found this helpful
Most Recent Reviews
Knights M4 RAS by wayne b., November 27, 2025
Real Knights RAS, fit fine over Colt SOCOM barrel. Received item before I had tracking. Great, thanks Optics Planet.
Most Recent Reviews
president#1 by steve, May 13, 2019
Was not a easy fit, had to chamber the inside of the groove to fit over the lock nut on the barrel, got it done but for the money it was not worth it.For the consumer that does not have tools, power would be the best, he would of not gotten this to f...
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1/8 found this helpful
Read All 17 Reviews

Product Discontinued by Manufacturer

Knight's Armament M4 Carbine RAS Forehand Assembly with Three 11-Rib Panels has been discontinued by Knight's Armament and is no longer available. Our product experts have helped us select these available replacements below.You can also explore other items in the AR15 Accessories, Gun Parts, AR 15 Tactical Rails, AR 15 Parts, Rifle Parts, AR Handguards & Forends, AR15 Upper Parts yourself to try and find the perfect replacement for you!

Product Info for Knight's Armament M4 Carbine RAS Forehand Assembly with Three 11-Rib Panels

The KAC M4 RAS (Rail Adapter System) was developed for use on the US militarys 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 RAS apart from other 2-piece quad rails on the market is that it securely locks to the rifles barrel nut via a clamp and screw arrangement, making it a very solid foundation upon which to mount tactical accessories. Includes three KAC 11 Rib Rail Panels.image

Rifle Requirements: The 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 AR-15/SR-15 based platforms only; not compatible with SR-25 variants.

Package Contents:

  • Knight's Armament M4 Carbine RAS Forehand Assembly with Three 11-Rib Panels
  • Installation instructions

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Related Products to Knight's Armament M4 Carbine RAS Forehand Assembly with Three 11-Rib Panels

Knight's Armament M4 Carbine RAS Forehand Assembly with Three 11-Rib Panels Unavailable & Discontinued Models

List of Unorderable Models

  • Knight's Armament M4 Carbine RAS, 5.56, with Three 11-Rib Panels, Black, 98064 , MPN: 98064 , UPC: 819064012580 , Code: KNA-HZ-LIUJJNL-98064
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