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Questions & Answers
Will this fit my ruger AR 5.6? Expert Answer

Yes. The Ergo M-LOK SuperLite Modular Free Float Rail Systems will fit your Ruger AR 556 with the included steel barrel nut. If you have a fixed front sight and delta ring, they must be removed in order to install this handguard.

by Ethan, Gear Expert, May 25, 2022
Is this made in the USA? Expert Answer

Please reach out to the manufacturer directly for more information.

by Brandon B, Gear Expert, November 11, 2021
4 Models Available
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Product Info for ERGO SuperLite Modular Free Float Rail System

The Ergo M-LOK SuperLite KeyModular Free Float Rail System has been designed to be the perfect way to make sure you have a stable platform on which to mount your favorite optics or accessories. Made with a 1.8 outside diameter and a compact 1.35in inside diameter, this Rifle Rail from ERGO has a clean and sleek profile that is great for any tactical shooter. The Ergo Superlite Ergo M-LOK KeyMod Rail System is a one piece, free float design that is made to Magpul M-LOK specifications. This AR Handguard is made by ERGO in specialized factories and is a top-quality, American made product. For a great way to mount optics and other important gear on your weapon, choose the Ergo M-LOK SuperLite Free Float Weapon Rail System.image

WARNING: California`s Proposition 65

Specifications for ERGO SuperLite Modular Free Float Rail System:

Manufacturer: ERGO
Color: Black
Finish: Anodized
Fabric/Material: 6061-T6 Aluminum
Gun Make: AR Platform
Gun Model: M16, AR-15
Gun Type: Rifle
Handguard Type: Free-Float
Gun Rail: M-LOK
Weight: 0.82 lb
Condition: New
Inner Diameter: 1.37 in
Outer Diameter: 1.8 in
Quantity: 1

Features of ERGO SuperLite Modular Free Float Rail System

  • Lightweight one piece free float design
  • M-LOK Compatible Slots accept ERGO and all other M-LOK Compatible accessories
  • Scalloped Picatinny rail slots for comfort and style
  • For AR-15/M16 platforms (Not AR-10, SR25, etc.)

Package Contents:

  • ERGO SuperLite Modular Free Float Rail System

ERGO SuperLite Modular Free Float Rail System Orderable Models

List of Orderable Models

  • ERGO SuperLite Modular Free Float Rail System, 1.37in Inside diameter, 3in Length, 4820-03-BK , MPN: 4820-03-BK , UPC: 874748009294 , Code: 3E-HZ-954A-4820-03-BK
  • ERGO SuperLite Modular Free Float Rail System, 1.37in Inside diameter, 5in Length, 4820-05-BK , MPN: 4820-05-BK , UPC: 874748009300 , Code: 3E-HZ-954A-4820-05-BK
  • Ergo M-LOK SuperLite Modular Free Float Rail System, 1.37 Interior Diameter Tube, Black, 4820-07-BK , MPN: 4820-07-BK , UPC: 874748008495 , Code: 3E-HZ-954A-4820-7-BK
  • Ergo M-LOK SuperLite Modular Free Float Rail System, AR-15 , M-16, 9in Length, 1.37in Interior Diameter Tube, Black, 4820-09-BK , MPN: 4820-09-BK , UPC: 874748007887 , Code: 3E-HZ-954A-4820-9

ERGO SuperLite Modular Free Float Rail System Unavailable & Discontinued Models

List of Unorderable Models

  • Ergo M-LOK SuperLite Modular Free Float Rail System, AR-15 , M-16, 12 in Length, 1.35in Interior Diameter Tube, Black, 4820-12-BK , MPN: 4820-12-BK , UPC: 874748006392 , Code: 3E-HZ-954A-4820-12
  • Ergo M-LOK SuperLite Modular Free Float Rail System, AR-15 , M-16, 15in Length, 1.35in. Interior Diameter Tube, Black, 4820-15-BK , MPN: 4820-15-BK , UPC: 874748006408 , Code: 3E-HZ-954A-4820-15
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Last updated 2026-10-03 UTC.