Surplus Knights Armament M4 RAS Quad Rail
Sale

Surplus Knights Armament M4 RAS Quad Rail

Knights Armament
SKU:
SUR-KAC-TITUS-RAS
$286.99 $149.99
(21 reviews)
Condition:
Used
Current Stock:
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Description

Knights Armament Company Titusville M4 RAS quad rail assembly. These are SURPLUS.

 

Screws may or may not be included.

 

The KAC M4 RAS (Rail Adapter 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.

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

 

Check out our Rail Covers & Foregrips!

 

Please read our surplus disclaimer prior to purchasing!

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Reviews

  • 5
    Great bang for the buck

    Posted by John on Oct 30th 2026

    I’ve been trying to find one of these for a decent price and this was it. Mine was in good condition. Clearly used and a little beat up but it was complete and a great value for the price. I put it on an older rifle so I didn’t want anything brand new anyway.

  • 5
    Good condition and Great customer service

    Posted by Joseph on Oct 24th 2026

    When my 1st rail came in it I was excited because it was in excellent shape. However when inspecting it I found the rear hardware was broken (Probably why it was in great condition). I reached out, and was promptly sent an RGA without any hesitation. The replacement came in today. Still in very good shape with some light wear, and what looks to be new hardware and screw. Cool factor was the name and rack number marked inside on the heat shield.

  • 5
    KAC rails

    Posted by Andrew on Oct 24th 2026

    Y’all are the best for having these right when I needed a set.

  • 5
    Amazing deal

    Posted by Ron on Oct 24th 2026

    Been looking for this rail at this price point for awhile. Paid more for ones in far worse condition. This one has minimal wear and perfectly functional. Recommend 100%!

  • 4
    Ras rail

    Posted by Kevin on Oct 8th 2026

    Happy with product. Wish they were cheaper but such is life

  • 5
    First time Wetworx purchaser and couldn't be happier

    Posted by Clayton on Oct 1st 2026

    This was my first time purchasing from Wetworx and in the words of the Terminator, "I'll be back." I usually temper my expectations any time I order surplus products. I was very impressed. RAS handguard set arrived well packaged and in great condition, with the screw. Thanks Wetworx team.

  • 5
    Works well

    Posted by B K on Sep 25th 2026

    Came complete and in great shape. Fits well on a Colt 16” HBAR barrel, no modifications, just read the installation instructions.

  • 5
    GREAT PRODUCT!!!!

    Posted by Anthony on Sep 4th 2026

    Have a picatinny rail from Knights Armament. Is used and perfectly functional!

  • 5
    Surplus Knights Armament M4 RAS Quad Rail

    Posted by Alex Miller on Aug 26th 2026

    I ordered this rail early Thursday morning and it arrived Saturday afternoon. Rail came with all parts to install and was in good condition, better than the example in the picture. I'm really pleased with my purchase