AU 7" Drop-In AR15/M4 Carbine Length Quad Rail

$75.00 $40.00
(You save $60.00 )
(107 reviews)
Current Stock:

AU 7" Drop-In AR15/M4 Carbine Length Quad Rail


The AU 7" Drop-In Carbine Length Quad Rail is a high quality 2-piece picatinny forend replacement for all mil-spec AR15/M4 carbine length plastic hand guards. They mount exactly like the factory hand guards but dissipate heat much more efficiently. Rails are located at the 12, 3, 6 and 9 o'clock positions, there are also 5 quick detach anti-rotate swivel ports located throughout for ideal sling attachment. The AU design ensures a secure fit with no movement on the weapon while providing a solid mounting platform for accessories. The precision machined rails enable consistent repeat of zero for any accuracy dependent devices such as optics or lasers.

Made in USA


  • No modifications to the firearm are required.
  • Installs in minutes
  • Four MIL-STD Picatinny rails at 12, 3, 6, and 9 o'clock
  • Five built-in anti-rotate sockets for QD sling swivels
  • Lifetime Warranty


  • Weight: 8< ounces
  • Machined from 6061/T651 Aircraft Grade Aluminum
  • Type 2 Class III Mil-Spec hard coat anodized


  • 5

    Posted by Siul G on 5th Feb 2021

    As expected direct fit no tools needed

  • 5
    outstanding value

    Posted by gunbuilder on 8th Jan 2021

    I bought two sets to see if they were any good. I was very happy with the quality and ended up buying 5 more sets.

  • 5
    Pleasantly surprised

    Posted by Tj M on 8th Jan 2021

    Once I figured out I had to put it in at an Angle I'm very happy, instead of paying 170 for the bcm quadrail to go with my bcm4 I'm definitely ok to have this on can't tell the difference

  • 5
    Perfect for drop in guard

    Posted by Matthew F. on 24th Dec 2020

    This is a perfect fit for your AR with a front sight post. The rails slip in perfectly and there are no sharp edges at all.

  • 5
    M4 Carbine Length Quad Rail

    Posted by Robert Anderson on 20th Dec 2020

    Quad rail arrived quickly and was made of quality material.

  • 5
    Great experience

    Posted by William Carr on 12th Dec 2020

    Thank you for the excellent service and fast shipping!

  • 5
    Nice Deal

    Posted by C.H on 10th Dec 2020

    Once I realized that you have to install it on an angle,

  • 5
    M4 Quad Rail

    Posted by TAC Mike on 5th Dec 2020

    These rails fit perfect and are rock solid on the Colt 6920.

  • 5
    Perfect as usual

    Posted by Casper-casper on 16th Nov 2020

    Another one of the many purchases from AU perfect and fast especially during these times