AR-15 Extended Quad Rail Handguard with FSP Cutout | Carbine Length | Drop-in

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100% Risk Free, Lifetime Warranty

The Monstrum Tactical drop-in AR-15 extended quad rail handguard with FSP cutout is a quick and easy install on any carbine length AR-15 rifle platform. It allows for the mounting of tactical accessories such as bipods, flashlights, and sights. The unique forward extension installs in place around your front sight post and provides for added rail space for accessory or hand placement.

Please note that the Extended Carbine Length Quad Rail with FSP Cutout will not fit on Ruger AR-556 model rifles without modification. For more details, please read the following: Quad Rail with A2 FSP Cutout Modified for Ruger AR-556.

Before purchasing and installation, we recommend viewing our installation guides.

  • Includes: Top Rail section, Bottom front rail section, Bottom rear rail section, 8 Allen Screws, Allen wrench
  • Materials: 6061 Aluminum Alloy
  • Compatibility: AR-15 Rifle with delta ring and front end cap installed. Will not fit on Ruger AR-556.
  • Weight: 18 oz
  • Length: 10.5 in
  • Height: 2.5 in
  • Internal Diameter: 1.38 in
  • Color: Black or Flat Dark Earth
  • Warranty: Lifetime

3 Reviews Hide Reviews Show Reviews

  • Extended Quad Rail Handguar

    Posted by Scott on Feb 26th 2019

    Forgot to add on the above review that it fit on a Palmetto State Armory (PSA) upper without any trouble at all.

  • Extended Quad Rail Handguard

    Posted by Scott on Feb 26th 2019

    Fits very well. 3 piece design. Comes with an installation hex tool for the hex screws. Looks good, fits tight and is functional. Ordered the 11 inch ladder covers that round out the look and feel. Great job Monstrum.

  • Great

    Posted by John on Feb 15th 2019

    Tried this handguard on an older build. Installation was a breeze. Fit is excellent. FDE color matched. Shipping and customer service were on point.

    I hesitated at first because some of the photos make it look like the lower portion of the handguard, forward of the FSB is lower. Once installed it lines up perfectly with the rear rail section. It's just that the rear section normally secures to the front mounting ring on the FSB, so it doesn't go as short as shown. Look at the one with it mounted, that's accurate. I think the photo should be replaced by the company. Additionally there is a cutout for a standard bayonet mount (it wont be useable as a bayonet mount, but it doesn't get in the way when installed properly). Hope this description helps.

    If you're looking for a drop in quad rail handguard, to fit onto a build with a carbine length FSB, in black or FDE, this is perfect, and priced perfectly.


All orders are shipped from our Warehouse in Orange County, CA via the United States Postal Service. Depending on your distance from California, your package delivery date can vary. Standard Shipping will arrive in 3-10 business days. Expedited shipping will arrive in 1-3 business days. Our shipping rates are:

  • For orders between 0–$49.99: Standard - $4.99 | Expedited - $8.99
  • For orders between $50–$149.99: Standard - FREE | Expedited - $8.99
  • For orders $149.99 and up: Standard - FREE | Expedited - $14.99

Next Day Air Shipping is not available. We are not responsible for delays caused by USPS & UPS or for abnormal weather. Shipping fees are non-refundable. Orders placed before 10am PST, Monday-Friday will be shipped same day. Orders placed after 10am or on the weekends/holidays will be shipped on the next general workday. Upon shipment, you will receive an email confirmation with tracking information. If there is an issue with a missing package, please contact your local post office to open an investigation and then contact our customer support staff for help.

Returns Policy

The Monstrum Tactical 30 Day Satisfaction Guarantee:
Monstrum Tactical stands behind each of our products with a 30-day no questions asked return policy. Return items must be returned in unused condition with all original parts and packaging. The customer is responsible for shipping. Contact our customer service department to begin the process.

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